Veterans mental health services have evolved significantly over the past century, shaped by the experiences of service members returning from various conflicts and the growing understanding of combat-related mental health challenges. The formal recognition of military-related mental health issues began during World War I, when physicians observed what was then called 'shell shock' in soldiers exposed to intense combat. However, treatment options were limited, and many veterans received little to no mental health support upon returning home. World War II brought unprecedented numbers of veterans requiring mental health care, leading to the expansion of Veterans Administration (VA) hospitals and the development of more systematic approaches to treating what was then called 'combat fatigue' or 'war neurosis.' The establishment of the Veterans Administration in 1930, later renamed the Department of Veterans Affairs in 1989, marked the beginning of a dedicated federal commitment to veteran healthcare, including mental health services. The Vietnam War era proved to be a turning point in veterans mental health care, as returning veterans faced unique challenges including public opposition to the war and delayed recognition of their service-related mental health needs. Vietnam veterans and their advocates played a crucial role in the formal recognition of ptsd-treatment">Post-Traumatic Stress Disorder (PTSD) as a distinct mental health condition in 1980, which revolutionized understanding and treatment of combat trauma. This recognition led to the development of specialized PTSD programs within the VA system and evidence-based treatments specifically designed for combat-related trauma. The 1990s saw significant expansion of VA mental health services, including the establishment of specialized programs for women veterans, substance abuse treatment, and family counseling services. The wars in Iraq and Afghanistan beginning in 2001 brought new challenges and opportunities for veterans mental health care, including increased awareness of traumatic brain injury (TBI), military sexual trauma (MST), and the unique needs of National Guard and Reserve personnel. This period saw the development of innovative treatments such as virtual reality therapy for PTSD, peer support programs, and telehealth">telehealth services to reach veterans in remote areas. Today, veterans mental health services encompass a comprehensive range of evidence-based treatments delivered through VA medical centers, community-based outpatient clinics, and partnerships with private providers, serving over 9 million veterans annually.