Links are in OP which I covered already upthread.
Though post-traumatic stress disorder (PTSD) is also a potential cause of suicide, Suitt notes that nondeployed troops have a higher risk of suicide, though it is not clear why that would be the case.
A U.S. Departments of Veterans Affairs study in 2019 showed that nondeployed veterans had a 61 percent higher suicide risk compared to the general U.S. population, where deployed vets’ risk was 41 percent higher than the general population.
A 2015 study by JAMA Psychiatry also showed no link between combat deployment and suicide. Authors of that study speculated that other factors that could force someone out of the military could also be factors in deaths by suicide.