There is another side of the military suicide rate, and that is homocide rate. There are many instances where someone came home, and killed a spouse. I think the army was studying a pattern of 101 st airborne units, that had quite a few murders.
There are many distinct differences from these middle east wars and other wars. WW2 men were drafted or enlisted, and the country was united in the cause, as a declared war after Pearl Harbor. Korea was a police action. Viet Nam was another policing action that escalated, so we drafted mostly 19 year olds, and they knew there was an end to there time served. Not that they didn't have severe phycological impact, it was different. These middle east wars not only are long, but most are called up reservists, who were not kids out of high school, they were established people with homes, jobs, and families. Bad enough they are expected to fight for their lives, but we ask them to return again and again, with no end in sight. They are stressed out, hated, and have families and homes, upside down facing forclosures due to income dropping, and all kinds of home hardships. In other wars, your only connection to home was handwritten letters, but now everyday they can call home with SKYPE cameras, see each other, and talk to each other, which probably makes it 10 times harder.
Its no wonder so many reach the brink of not taking it anymore. Our polititons all know that bringing back the draft would be political suicide, so we just keep asking our all volunteer army to keep doing this thankless deed, while the rest of the world just goes on with life. Kiss the ground they walk on all you young people, becasue what we ask of them is out of balance for a country. You can not expect only one group to continually stay in combat, and never expect anyone else to serve in the military. As unfair as Viet Nam was in my era, if you got drafted you knew it would be for 2 years. These guys just finished in Iraq, and got rewarded by being sent to Afganistan for more. No wonder they have a high suicide rate.