Mental Health Outcomes Among Transgender Veterans and Active-Duty Service Members in the United States: A Systematic Review

According to the United States Transgender Survey, 39% of respondents reported experiencing serious psychological distress (based on the Kessler 6 Psychological Distress Scale) in the past 30 days compared with 5% in the general population.¹ Additionally, 40% of respondents attempted suicide in their lifetime, compared with 5% in the general population.¹ Almost half of respondents reported being sexually assaulted at some time in their life, and 10% reported being sexually assaulted in the past year.¹

Studies have also shown that veterans and active-duty service members experience worse mental health outcomes and are at increased risk for suicide than civilians and nonveterans.^2-5 About 1 in 4 active-duty service members meet the criteria for diagnosis of a mental illness.⁴ Service members were found to have higher rates of probable anxiety and posttraumatic stress disorder (PTSD) compared with the general population.^2,6 In 2018, veteran suicide deaths accounted for about 13% of all deaths by suicide in the US even though veterans only accounted for about 7% of the adult population in that year.^5,7 Also in 2018, about 17 veterans committed suicide per day.⁵ According to the Health Related Behaviors Survey of active-duty service members, about 18% reported thinking about attempting suicide some time in their lives compared with 4% of the general population.^2,3 Additionally, 5% of service members reported previous suicide attempts compared with 0.5% in the general population.^2,3 It is clear that transgender individuals, veterans, and service members have certain mental health outcomes that are worse than that of the general population.^1-7

Transgender individuals along with LGB (lesbian, gay, bisexual) individuals have long faced discrimination and unfair treatment in the military.^8-11 In the 1920s, the first written policies were established that banned gay men from serving in the military.⁹ The US Department of Defense (DoD) continued these policies until in 1993, the “Don’t Ask Don’t Tell” policy was established, which had the façade of being more inclusive for LGB individuals but forced LGB service members to hide their sexual identity and continued the anti-LGBTQ messages that previous policies had created.^8,10,11 In 2010, “Don’t Ask Don’t Tell” was repealed, which allowed LGB individuals to serve in the military without concealing their sexual orientation and without fear of discharge based on their sexual identity.¹¹ This repeal did not allow transgender individuals to serve their country as the DoD categorized transgender identity as a medical and mental health disorder.^8,11

In 2016, the ban on transgender individuals serving in the military was lifted, and service members could no longer be discharged or turned away from joining the military based on gender identity.^8,12 However, in 2018, this order was reversed. The new policy stated that new service members must meet requirements and standards of their sex assigned at birth, and individuals with a history of gender dysphoria or those who have received gender-affirming medical or surgical treatment were prohibited to serve in the military.^8,13 This policy did not apply to service members who joined before it took effect. Finally, in April 2021, the current policy took effect, permitting transgender individuals to openly serve in the military. The current policy states that service members cannot be discharged or denied reenlistment based on their gender identity and provides support to receive gender-affirming medical care.¹⁴ Although transgender individuals are now accepted in military service, there is still much progress needed to promote equity among transgender service members.

In 2015, according to the Health Related Behaviors Survey of active-duty service members, 0.6% of service members identified as transgender, the same percentage as US adults who identify as transgender.^2,15 Previous research has shown that the prevalence of gender identity disorder among veterans is higher than that among the general US population.¹⁶ Many studies have shown that worse mental health outcomes exist among LGBTQ veterans and service members compared with heterosexual, cisgender veterans and service members.^17-24 However, fewer studies have focused solely on mental health outcomes among transgender veterans and active-duty service members, and there exists no current literature review on this topic. In this article, we present data from the existing literature on mental health outcomes in transgender veterans and active-duty service members. We hypothesize, based on the current literature, that transgender veterans and service members have worse mental health outcomes than their cisgender counterparts. Key terms used in this paper are defined in the Key Definitions.^25-27

Methods

We conducted a systematic review of articles presenting data on mental health outcomes in transgender veterans and active-duty service members. The National Library of Medicine PubMed database was searched using the following search terms in various combinations: mental health outcomes, transgender, veterans, military, active duty, substance use, and sexual trauma. The literature search was performed in August 2021 and included articles published through July 31, 2021. Methodology, size, demographics, measures, and main findings were extracted from each article. All studies were eligible for inclusion regardless of sample size. Studies that examined the LGBTQ population without separating transgender individuals were excluded. Studies that examined mental health outcomes including, but not limited to, PTSD, depression, suicidality, anxiety, and substance use disorders (SUDs) in addition to sexual trauma were included. Studies that only examined physical health outcomes were excluded. Qualitative studies, case reports, and papers that did not present original data were excluded (Figure).

Results

Our search resulted in 86 publications. After excluding 65 articles that did not meet the inclusion criteria, 19 studies were included in this review. The Appendix shows the summary of findings from each study, including the study size and results. All studies were conducted in the United States. Most papers used a cross-sectional study design. Most of the studies focused on transgender veterans, but some included data on transgender active-duty service members.

We separated the findings into the following categories based on the variables measured: mental health, including depression, anxiety, PTSD, and serious mental illness; suicidality and self-harm; substance use; and military sexual trauma (MST). Many studies overlapped multiple categories.