Validation of the Pittsburgh Sleep Quality Index Addendum for Posttraumatic Stress Disorder (PSQI‐A) in U.S. Male Military Veterans

Sleep disturbances are core symptoms of posttraumatic‐stress disorder (PTSD), yet they bear less stigma than other PTSD symptoms. Given the growing number of returning military veterans, brief, valid assessments that identify PTSD in a minimally stigmatizing way may be useful in research and clinical practice. The study purpose was to evaluate the psychometric properties of the Pittsburgh Sleep Quality Index Addendum for PTSD (PSQI‐A), and to examine its ability to identify PTSD cases among U.S. male military veterans. Male military veterans (N = 119) completed the PSQI‐A, as well as measures of sleep quality, combat exposure, posttraumatic stress, depression, and anxiety. Veterans with PTSD had higher PSQI‐A identified disruptive nocturnal behaviors than veterans without PTSD. The PSQI‐A had good internal consistency and convergent validity with sleep quality, combat exposure, PTSD symptoms, depression, and anxiety. A cutoff score ≥ 4 provided an area under the curve = .81, with 71% sensitivity, 82% specificity, and 60% positive and 83% negative predictive value for a clinical diagnosis of PTSD; correct classification was 74%. The PSQI‐A is a valid measure to possibly detect PTSD among male military veterans. Assessment of disruptive nocturnal behaviors may provide a cost‐effective, nonstigmatizing approach to PTSD screening without directly probing for trauma exposure(s).     

Sleep Quality Among U.S. Military Veterans With PTSD: A Factor Analysis and Structural Model of Symptoms

Poor sleep quality among individuals with posttraumatic stress disorder (PTSD) is associated with poorer prognosis and outcomes. The factor structure of the most commonly employed measure of self‐reported sleep quality, the Pittsburgh Sleep Quality Index (PSQI), has yet to be evaluated among individuals with PTSD. The current study sought to fill this gap among a sample of 226 U.S. military veterans with PTSD (90% with co‐occurring mood disorders, 73.5% with substance use disorders). We evaluated the factor structure of the PSQI by conducting an exploratory factor analysis (EFA) in approximately half of the sample (n = 111). We then conducted a second EFA in the other split half (n = 115). Lastly, we conducted a path analysis to investigate the relations between sleep factors and PTSD symptom severity, after accounting for the relation with depression. Results suggested sleep quality can best be conceptualized, among those with PTSD, as a multidimensional construct consisting of 2 factors, Perceived Sleep Quality and Efficiency/Duration. After accounting for the association between both factors and depression, only the Perceived Sleep Quality factor was associated with PTSD (β = .51). The results provide a recommended structure that improves precision in measuring sleep quality among veterans with PTSD.     

Associations Between Perceived Social Reactions to Trauma‐Related Experiences With PTSD and Depression Among Veterans Seeking PTSD Treatment

The Social Acknowledgment Questionnaire (SAQ; Maercker & Mueller, 2004 ) is a measure of trauma survivors’ perceptions of social acknowledgment and disapproval from others, and these factors are shown to be associated with posttraumatic stress disorder (PTSD) among civilian trauma survivors. This study seeks to validate the structure of the SAQ among U.S. military veterans and test the hypothesis that family and general disapproval are associated with PTSD and depression among veterans. Participants were 198 U.S. veterans who experienced military trauma and completed an intake evaluation through a Veterans Affairs PTSD treatment program. Structural equation modeling (SEM) results supported a well‐fitting 3‐factor model for the SAQ that was similar to prior studies in capturing the constructs of social acknowledgment, general disapproval, and family disapproval. SEM results also showed that all 3 of the SAQ factors were associated with veterans’ depression (?.31, .22, and .39, respectively), whereas only general disapproval was related to veterans’ PTSD. This is the first study of which we are aware to investigate the factor structure of the SAQ in a veteran sample and to investigate the relationship between SAQ factors and trauma survivors’ depression. Results build upon prior findings by showing the importance of positive and negative social reactions to veterans’ traumatic experiences.     

PTSD Symptoms and Pain in Canadian Military Veterans: The Mediating Roles of Anxiety,Depression, and Alcohol Use

Symptoms of posttraumatic stress disorder (PTSD) and pain are often comorbid among veterans. The purpose of this study was to investigate to what extent symptoms of anxiety, depression, and alcohol use mediated the relationship between PTSD symptoms and pain among 113 treated male Canadian veterans. Measures of PTSD, pain, anxiety symptoms, depression symptoms, and alcohol use were collected as part of the initial assessment. The bootstrapped resampling analyses were consistent with the hypothesis of mediation for anxiety and depression, but not alcohol use. The confidence intervals did not include zero and the indirect effect of PTSD on pain through anxiety was .04, CI [.03, .07]. The indirect effect of PTSD on pain through depression was .04, CI [.02, .07]. These findings suggest that PTSD and pain symptoms among veterans may be related through the underlying symptoms of anxiety and depression, thus emphasizing the importance of targeting anxiety and depression symptoms when treating comorbid PTSD and pain patients.     

Mental Disorders and Their Association With Disability Among Internally Displaced Persons and Returnees in Georgia

There remains limited evidence on comorbidity of mental disorders among conflict‐affected civilians, particularly internally displaced persons (IDPs) and former IDPs who have returned to their home areas (returnees). The study aim was to compare patterns of mental disorders and their influence on disability between IDPs and returnees in the Republic of Georgia. A cross‐sectional household survey was conducted with adult IDPs from the conflicts in the 1990s, the 2008 conflict, and returnees. Posttraumatic stress disorder (PTSD), depression, anxiety, and disability were measured using cut scores on Trauma Screening Questionnaire, Patient Health Questionnaire 9, Generalised Anxiety Disorder 7, and the WHO Disability Assessment Schedule 2.0. Among the 3,025 respondents, the probable prevalence of PTSD, depression, anxiety, and comorbidity (>1 condition) was 23.3%, 14.0%, 10.4%, 12.4%, respectively. Pearson correlation coefficients (p < .001) were .40 (PTSD with depression), .38 (PTSD with anxiety), and .52 (depression with anxiety). Characteristics associated with mental disorders in regression analyses included displacement (particularly longer‐term), cumulative trauma exposure, female gender, older age, poor community conditions, and bad household economic situation; coefficients ranged from 1.50 to 3.79. PTSD, depression, anxiety, and comorbidity were associated with increases in disability of 6.4%, 9.7%, 6.3%, and 15.9%, respectively. A high burden of psychiatric symptoms and disability persist among conflict‐affected persons in Georgia.     

Clinical Manifestations of Trauma Exposure in Fibromyalgia: The Role of Anxiety in the Association Between Posttraumatic Stress Symptoms and Fibromyalgia Status

Little research has investigated how traumatic experiences relate to fibromyalgia (FM). We explored the presence of trauma exposure in a sample of Spanish participants with FM and examined the associations between (a) the number and type of traumatic experiences and posttraumatic stress disorder (PTSD) symptoms and (b) the severity of clinical manifestations in FM, testing for possible mediation models. Participants were 173 FM patients and 53 healthy controls aged 24 to 66 years. Traumatic event type (physical trauma, physical and sexual abuse, psychological trauma), PTSD symptoms, pain intensity, sleep disturbance, anxiety, depression, coping style, and daily functioning were evaluated via self-report. Fibromyalgia patients reported a higher percentage of trauma exposure than controls, more traumatic experiences (mainly emotional and physical trauma), and more PTSD symptoms, Hedges’ gs/Cohen's ds = 0.42–0.76. Most FM patients reported having experienced their most distressing traumatic experience and PTSD symptoms before FM diagnosis. PTSD symptom severity was associated with more pain, sleep disturbances, anxiety, depression, coping style, and functional impairment, rs = .23–.33, ps = .025–.008. A multiple mediation analysis showed a significant indirect effect of anxiety in the association between PTSD symptoms and daily functioning. In a subset of FM patients, PTSD symptoms were associated with major clinical symptoms. The results suggest future research should explore the effectiveness of trauma-focused therapy compared to standard cognitive behavioral therapy for these patients.     

The Association Between Negative Trauma‐Related Cognitions and Pain‐Related Functional Status Among Veterans With Posttraumatic Stress Disorder and Alcohol Use Disorder

Among veterans with posttraumatic stress disorder (PTSD), alcohol use disorders (AUDs) are highly prevalent. Furthermore, PTSD frequently co‐occurs with chronic pain (CP), and CP is associated with an increased risk of AUD. Pain‐related beliefs and appraisals are significantly associated with poorer pain‐related functional status, yet few studies have examined negative trauma‐related cognitions and their impact on pain‐related functional disability in veterans with co‐occurring PTSD and AUD. Accordingly, we examined the association between negative trauma‐related cognitions and pain severity and pain disability in 137 veterans seeking treatment for PTSD and AUD. Using hierarchical multiple linear regression, we found that higher levels of negative trauma‐related cognitions (e.g., “I am completely incompetent”) were associated with a higher level of pain severity, after controlling for PTSD symptom severity and frequency of alcohol use, total R² = .07, ΔR² = .06. Additionally, as hypothesized, we found that higher levels of negative trauma‐related cognitions were associated with higher levels of pain disability, after controlling for PTSD symptom severity, frequency of alcohol use, and pain severity, total R² = .46, ΔR² = .03. Given that negative trauma‐related cognitions contributed to pain severity and pain disability, even when controlling for PTSD severity and frequency of alcohol use, future studies should explore the potential impact of interventions that address negative trauma‐related cognitions (e.g., prolonged exposure or cognitive processing therapy) on pain severity and disability.     

The Impact of Common Psychiatric and Behavioral Comorbidities on Functional Disability Across Time and Individuals in Post-9/11 Veterans

Returning veterans often face multiple concurrent psychiatric and behavioral conditions that negatively impact reintegration into civilian life and are associated with functional disability. Understanding how conditions interact to negatively impact functioning is an important step toward developing holistic treatment approaches optimized for this population. This study utilized a cross-sectional and prospective longitudinal cohort design, applying regression algorithms to understand the relative contribution of common clinical issues to functional disability in U.S. veterans who served after the September 11, 2001 (9/11), terror attacks. Community-dwelling post-9/11 veterans (N = 397) completed detailed assessments, including common clinical condition diagnoses, combat experience, and demographics, which were used to predict functional disability (World Health Organization Disability Assessment Schedule); 205 participants were reassessed approximately 1–2 years after enrollment. Regression analyses showed a strong association between the predictor variables and functional disability, f ² = 1.488. Validation analyses showed a high prediction ability of functional disability to independent samples, r = .719, and across time in the same individuals, r = .780. The strongest predictors included current posttraumatic stress disorder, depressive disorder, sleep disturbance, and pain diagnoses. These results demonstrate the importance of considering multiple common co-occurring conditions when assessing functional disability in post-9/11 veterans and suggest that certain syndromes contribute the most unique information to predicting functional disability with high confidence. As most U.S. veterans utilize private healthcare systems, these results have clinical utility for both Veterans Affairs and civilian healthcare practitioners in assessing and monitoring functional disability in post-9/11 veterans over time.     

Exposure to potentially morally injurious events,disruption in assumptive world,moral injury symptoms,and psychological distress among Israeli female veterans

Exposure to potentially morally injurious events (PMIEs) during military service is associated with mental health problems. However, knowledge about these associations and possible mechanisms of effect among female combat veterans is sparse. This study examines associations between PMIEs, posttraumatic stress disorder (PTSD), complex PTSD, depression and anxiety symptoms among female veterans, as well as the mediating role of disruption in assumptive world and moral injury (MI) symptoms. A volunteer sample of Israeli female combat veterans (n = 885) and non-combat veterans (n = 728) responded to self-report questionnaires in a cross-sectional design study. Results show that combat veterans reported higher levels of PMIEs, PTSD and MI symptoms, but not CPTSD, depression and anxiety symptoms, as compared to non-combat veterans. Importantly, PMIEs was indirectly associated with PTSD, complex PTSD, depression and anxiety symptoms through serial mediators of disruption in assumptive world and MI symptoms. This study emphasized the exposure to PMIEs and its posttraumatic sequelae among female combat veterans as compared to non-combat veterans. Our findings also suggest that future longitudinal studies should examine the mediating role of disruption in assumptive world and MI symptoms for the deleterious effects of exposure to PMIEs during military service.     

Concurrent Mild Traumatic Brain Injury and Posttraumatic Stress Disorder Is Associated With Elevated Tau Concentrations in Peripheral Blood Plasma

Concurrent mild traumatic brain injury (mTBI) and posttraumatic stress disorder (PTSD) are common in U.S. military service members and veterans. Tau and amyloid‐beta‐42 (Aβ42) are proteins that have been linked to cognitive impairment, neurological hallmarks of Alzheimer's disease, and may also relate to recovery from mTBI. However, the role of these proteins in the maintenance or resolution of chronic symptoms has not yet been determined. Participants in the current study were 102 service members and veterans who had sustained an mTBI (n = 84) or injured controls (IC) without TBI (n = 18). They were categorized into three groups based on the presence or absence of mTBI and PTSD: IC/PTSD‐Absent (n = 18), mTBI/PTSD‐Absent (n = 63), and mTBI/PTSD‐Present (n = 21). Concentrations of tau and Aβ42 in peripheral blood plasma were measured using Simoa^TM, an ultrasensitive technology, and compared across groups. Tau concentrations were highest in the mTBI/PTSD‐Present group, F(2, 99) = 4.33, p = .016, compared to the other two groups. Linear multiple regression was conducted to determine the independent effects of PTSD and mTBI on tau concentrations, controlling for gender and sleep medication. PTSD was a significant and independent predictor of tau concentrations, β = .25, p = .009, η_p² = .26. Aβ42 concentrations did not differ between the groups. The results indicated that PTSD was associated with an elevation of tau in peripheral blood and suggest that there may be increased biological effects of PTSD in this young cohort of service members and veterans following mTBI.     

Gender Differences in Machine Learning Models of Trauma and Suicidal Ideation in Veterans of the Iraq and Afghanistan Wars

Suicide rates among recent veterans have led to interest in risk identification. Evidence of gender‐and trauma‐specific predictors of suicidal ideation necessitates the use of advanced computational methods capable of elucidating these important and complex associations. In this study, we used machine learning to examine gender‐specific associations between predeployment and military factors, traumatic deployment experiences, and psychopathology and suicidal ideation (SI) in a national sample of veterans deployed during the Iraq and Afghanistan conflicts (n = 2,244). Classification, regression tree analyses, and random forests were used to identify associations with SI and determine their classification accuracy. Findings converged on several associations for men that included depression, posttraumatic stress disorder (PTSD), and somatic complaints. Sexual harassment during deployment emerged as a key factor that interacted with PTSD and depression and demonstrated a stronger association with SI among women. Classification accuracy for SI presence or absence was good based on the receiver operating characteristic area under the curve, men = .91, women = .92. The risk for SI was classifiable with good accuracy, with associations that varied by gender. The use of machine learning analyses allowed for the discovery of rich, nuanced results that should be replicated in other samples and may eventually be a basis for the development of gender‐specific actuarial tools to assess SI risk among veterans.     

Sleep Quality and Reexperiencing Symptoms of PTSD Are Associated With Current Pain in U.S. OEF/OIF/OND Veterans With and Without mTBIs

Pain, a debilitating condition, is frequently reported by U.S. veterans returning from Afghanistan and Iraq. This study investigated how commonly reported clinical factors were associated with pain and whether these associations differed for individuals with a history of chronic pain. From the Boston metropolitan area, 171 veterans enrolled in the Veterans Affairs Center of Excellence were assessed for current posttraumatic stress disorder (PTSD) symptom severity, current mood and anxiety diagnoses, lifetime traumatic brain injury, combat experiences, sleep quality, and alcohol use. Hierarchical regression models were used to determine the association of these conditions with current pain. Average pain for the previous 30 days, assessed with the McGill Pain Questionnaire, was 30.07 out of 100 (SD = 25.43). Sleep quality, PTSD symptom severity, and alcohol use were significantly associated with pain (R² = .24), as were reexperiencing symptoms of PTSD (R² = .25). For participants with a history of chronic pain (n = 65), only PTSD symptoms were associated with pain (R² = .19). Current pain severity was associated with increased PTSD severity (notably, reexperiencing symptoms), poor sleep quality, and increased alcohol use. These data support the hypothesis that PTSD symptoms influence pain, but suggest that problems with sleep and alcohol use may exacerbate the relationship.     

Presenting Concerns of Veterans Entering Treatment for Posttraumatic Stress Disorder

Patient‐centered care involves engaging patients as partners in establishing treatment priorities. No prior studies have examined what specific problems veterans hope to address when they enter posttraumatic stress disorder (PTSD) treatment. Veterans starting outpatient (n = 216) and residential (n = 812) PTSD treatment in 2 multisite care management trials specified (open‐ended) the 2 or 3 problems that they most wanted to improve through treatment. Over 80% mentioned PTSD‐symptom‐related concerns including PTSD or trauma (19.2% to 19.9% of patients), anger (31.0% to 36.7%), sleep problems (14.3% to 27.3%), nightmares (12.3% to 19.4%), and estrangement/isolation (7.9% to 20.8%). Other common problems involved depression (23.1% to 36.5%), anxiety not specific to PTSD (23.9% to 27.8%), relationships (20.4% to 24.5%), and improving coping or functioning (19.2% to 20.4%). Veterans’ treatment goals varied significantly by outpatient versus residential setting, gender, and period of military service. Our findings confirm the importance of educating patients about how available efficacious treatments relate to clients’ personal goals. Our results also suggest that clinicians should be prepared to offer interventions or provide referrals for common problems such as anger, nightmares, sleep, depression, or relationship difficulties if these problems do not remit with trauma‐focused psychotherapy or if patients are unwilling to undergo trauma‐focused treatment.     

Mild Traumatic Brain Injury,PTSD, and Psychosocial Functioning Among Male and Female U.S. OEF/OIF Veterans

This study examined the unique and combined relationship between mild traumatic brain injury (mTBI) and posttraumatic stress disorder (PTSD) with psychosocial functioning in a cohort of 1,312 U.S. male and female veterans of Operations Enduring Freedom (OEF) and Iraqi Freedom (OIF) enrolled in the Veterans After‐Discharge Longitudinal Registry (Project VALOR). We assessed mTBI with structured screening questions reflective of current TBI classification standards and PTSD via the SCID‐IV PTSD module; all other variables were assessed by self‐report questionnaires. We identified significant diagnostic group differences in psychosocial functioning for both sexes. Individuals with PTSD, with or without a history of mTBI, reported significantly worse psychosocial functioning than individuals with mTBI alone or neither mTBI nor PTSD (males, η²_p = .11, p < .001; females, η²_p = .14, p < .001), even after adjusting for demographics and severity of chronic pain. The results suggested that veterans experiencing PTSD, regardless of whether they had a history of mTBI, were at increased risk for long‐term psychosocial impairment. Further research examining possible benefits from improved access to resources and treatment to address these needs would be valuable.     

Mild Traumatic Brain Injury and Treatment Response in Prolonged Exposure for PTSD

A proportion of U.S. veterans returning from Iraq and Afghanistan have experienced mild traumatic brain injury (mTBI), which is associated with increased risk for developing posttraumatic stress disorder (PTSD). Prolonged Exposure (PE) has proven effectiveness in the treatment of PTSD; however, some clinicians have reservations about using PE with individuals with a history of mTBI. We examined the impact of PE for veterans with PTSD and with or without a history of mTBI in a naturalistic sample of 51 veterans who received PE at a Veterans Health Administration PTSD clinic. We also analyzed previously collected data from a controlled trial of 22 veterans randomly assigned to PE or present centered therapy. For both sets of data, we found that PE reduced symptom levels and we also did not detect an effect for mTBI, suggesting that PE may be helpful for individuals with PTSD and a history of mTBI.     

Response to Cognitive Processing Therapy in Veterans With and Without Obstructive Sleep Apnea

Recent studies have called attention to the need for enhancing treatment outcome in trauma‐focused psychotherapies, such as cognitive processing therapy (CPT), with veterans. Given the prevalence of posttraumatic‐related sleep disturbances, and the role of sleep in emotional learning and processing, sleep quality may be a target for improving CPT outcome. Elevated rates of obstructive sleep apnea (OSA) have been reported in samples of veterans with posttraumatic stress disorder (PTSD); however, the impact of OSA on response to CPT is unclear. In this study, CPT outcome was examined in veterans with and without a diagnosis of OSA. Following chart review, 68 OSA‐positive and 276 OSA‐negative veterans were identified. Generalized estimating equations were used to compare between‐group differences in weekly self‐reported PTSD symptomatology. The OSA‐positive veterans reported greater PTSD severity over the course of treatment and at posttreatment compared with veterans without OSA (B = −0.657). Additionally, OSA‐positive veterans with access to continuous positive airway pressure (CPAP) therapy reported less PTSD severity relative to OSA‐positive veterans without access to CPAP (B = −0.421). Apnea appears to be a contributing factor to the reduced effectiveness of evidence‐based psychotherapy for veterans with PTSD; however, preliminary evidence indicates that CPAP therapy may help mitigate the impact of OSA on treatment outcome.     

Prolonged exposure for PTSD in a Veterans Health Administration PTSD clinic

With the move toward dissemination of empirically supported treatments in the Veterans Health Administration (VHA), dissemination of additional data concerning the effectiveness of prolonged exposure (PE) among veterans is important. The authors present clinical treatment data from veterans with chronic posttraumatic stress disorder (PTSD) treated in a VHA PTSD clinic (N = 10). Veterans demonstrated significant reductions in total PTSD symptoms from pre‐ to posttreatment. Returning veterans from the conflicts in Afghanistan and Iraq and other era veterans (Vietnam Veterans and military sexual trauma veterans) demonstrated significant reductions in PTSD. In addition, veterans demonstrated significant reductions in depression from pre‐ to posttreatment. In conclusion, PE is effective in reducing the symptoms of PTSD in veterans.     

Smoking in vietnam combat veterans with post-traumatic stress disorder

The present study investigated smoking prevalence, smoking motives, demographic variables and psychological symptoms in 124 help-seeking, male Vietnam combat veterans with post-traumatic stress disorder (PTSD). A high percentage of these veterans with post-traumatic stress disorder (PTSD). A high percentage of these veterans smoked (60%). Vietnam veterans with PTSD who smoked were more likely than those who did not smoke to report higher levels of PTSD symptoms, depression and trait anxiety. Increased depression was associated with increased automatic smoking. Smokers reported a high frequency of smoking in response to military memories. Implications for smoking interventions, cessation, and relapse prevention efforts are discussed.     

Causes of Death Among Male Veterans Who Received Residential Treatment for PTSD

Previous studies have shown elevated mortality among psychiatric and substance abusing patients, including veterans with PTSD. Although early studies showed elevated deaths from external causes among Vietnam veterans in the early postwar years, more recent studies have also shown increased health problems among veterans with PTSD. This study compared mortality due to behavioral causes versus other diseases among 1,866 male veterans treated for PTSD. Death certificates obtained for 110 veterans indicated behavioral causes accounted for 62.4% of deaths, standardized mortality ratio = 3.4-5.5, including accidents (29.4%), chronic substance abuse (14.7%), and intentional death by suicide, homicide, or police (13.8%). Results suggest possible opportunities to improve outcomes of this at-risk patient population through harm reduction interventions and improved continuity of care.     

Associations Between Trauma‐Related Rumination and Symptoms of Posttraumatic Stress and Depression in Treatment‐Seeking Female Veterans

Trauma‐related rumination is a cognitive style characterized by repetitive negative thinking about the causes, consequences, and implications of a traumatic experience. Frequent trauma‐related rumination has been linked to posttraumatic stress disorder (PTSD) and depression in civilian samples but has yet to be examined among military veterans. This study extended previous research by examining trauma‐related rumination in female veterans who presented to a Veterans Affairs women's trauma recovery clinic (N = 91). The study had two main aims: (a) to examine associations between trauma‐related rumination and specific PTSD symptoms, adjusting for the overlap between trauma‐related rumination and other relevant cognitive factors, such as intrusive trauma memories and self‐blame cognitions; and (b) to assess associations between trauma‐related rumination, PTSD, and depression, adjusting for symptom comorbidity. At intake, patients completed a semistructured interview and self‐report questionnaires. Primary diagnoses were confirmed via medical record review. Trauma‐related rumination was common, with more than 80% of patients reporting at least sometimes engaging in this cognitive style in the past week. After adjusting for other relevant cognitive factors, trauma‐related rumination was significantly associated with several specific PTSD symptoms, r_ps = .33–.48. Additionally, the severity of trauma‐related rumination was associated with overall PTSD symptom severity, even after adjusting for comorbid depression symptoms, r_p² = .35. In contrast, the association between trauma‐related rumination and depressive symptom severity was not significant after adjusting for comorbid PTSD symptoms, r_p² = .008. These results highlight trauma‐related rumination as a unique contributing factor to the complex clinical presentation for a subset of trauma‐exposed veterans.