The effects of deployment to military combat on the individual and the family system are wide-reaching and can be severe. According to the U.S. Department of Defense, there were more than 3.5 million current military personnel and almost 24 million veterans in 2018. The Army has the largest number of active-duty members, followed by the Navy, the Air Force, and the Marine Corps. Military service presents its own set of risk and protective factors for a variety of mental health issues, including post-traumatic stress disorder (PTSD), traumatic brain injury (TBI), depression and suicide, substance abuse, and interpersonal violence. In particular, transitioning from combat back to home life can be particularly trying for veterans and their families.