There could be and I am sure that there are other reasons for that other than them feeling invincible, like readjustment or non- readjustment to a civilized world compared to living in a 24 - 7 bombing zone for 12+ months.
Nothing to do with feeling invincible.
Oh, sure, and the report mentioned that, but there was a military person on the show, that said that they counsel the troops when they are returning to the US...
They counsel them on possible marital problems, job problems, emotional problems, etc.,, he said that when talking to the families and friends of a lot of these men/women, they said that these people in some cases seemed to take chances that they might not have before Iraq...
Like drinking more when knowing they are going to drive, driving faster than before...
I think he was saying it could be due to a lost things, but there ARE, percentage wise, a lot more that have died after returning from overseas fighting, than being discharged from a stint here in the states..
I am not saying I know anything, I am repeating what I remember about the report on Fox.
Almost 90 years ago, Raoul Lufbery, an American pilot in France said "There is no 'after the war' for a fighter pilot'". He didn't make it through the war. I think there has always been a lot of that sort of problem for combat veterans.