Among the causes to which the increase is attributed are posttraumatic stress disorder, exposure to combat, marital strife, financial problems, and the toll taken by multiple deployments. Also, seeking help for mental health problems is often seen as a sign of weakness and a barrier to advancement in the military. Psychiatrist Stephen Xenakis, M.D., a retired Army brigadier general, told the AP that these suicides are a "sign in general of the stress the Army has been under over the 10 years of war. We've seen before that these signs show up even more dramatically when the fighting seems to go down and the Army is returning to garrison."
To read much more about the problem of suicide among members of the military, see Psychiatric News here and here.