Something tells me that the eventual tally of Post Traumatic Stress Disorder (PTSD) from th Iraq war could top that of the Vietnam war, on a per-man basis.
I have a theory.
In the 'Nam, most everyone had three forms of stress relief available: booze, pot and beaver (bald beavers!). When you finally got some some time off, from humping the trail and/or fighting in the jungle, or flying the unfriendly skies of North Vietnam, you usually went to the Class Six (liquor) store, got a bottle of Jim Beam for $0.90 (that's right, ninety cents) and proceeded to get wasted. Or you went just outside the main gate and scored a shopping bag full of good Thai pot for $3.00. Potheads didn't drink as much, because they had to find a secure place, and clean that bagful of pot, removing stems and seeds, and cleaning was a labor-intense job and you couldn't be wasted doing it.
After the first few shots, or that first joint, you were ready to go "downtown" to the whorehouse district, and survey the merchandise (or just go to your favorite cathouse and wait for your favorite girl to be free). This wasn't expensive, so many GIs took advantage of the "local economy".
Of course, that meant exposing yourself to the local STDs, also. In Thailand, where I flew most of my war sorties, the military and the locals came to an understanding. The local political chief was paid a bribe to have doctors administer simple tests (which the US military medical lab processed, probably) to all the girls every week, each girl being registered by the government (no, none of them ever said to me "I'm a government agent, GI, even my twat is registered") and had a number which YOU WERE SUPPOSED TO WRITE DOWN AND RETAIN, EITHER BEFORE OR AFTER THE ACTION. Then, the numbers of the girls with STDs were posted on the bulletin board or even read aloud on the base (post) radio station. This was known as the "numbers game" or even "the lottery". If your number came up, you were screwed, if your Top Kick or the doctor you had to see for the shots were hard-ass. It was a UCMJ (Universal Code of Military Justice) violation to abuse your own body, since it belonged to Uncle Sam. You could get an Article 15 (Captain's Mast for Navy types) and lose a stripe or get fined up to a month's pay, but few did. You could say that it was the screwing you got for the screwing you'd had.
So, there was stress relief for the troops. According to my sources, none of that is available in the Iraq theater of war.
Gonna be some FUBAR heads on some of those boys and girls when they come home...or maybe I'm wrong, and the military has taught them how to manage their stress better than they taught us (with zero instruction).
Time will tell.