40,000. This speaks for itself.

The number of U.S. troops diagnosed by the military with post-traumatic stress disorder (PTSD) jumped nearly 50 percent in 2007 over the previous year, as more of them served lengthy and repeated combat tours in Iraq and Afghanistan, Pentagon data released yesterday show.

The increase brings the total number of U.S. troops diagnosed by the military with PTSD after serving in one of the two conflicts from 2003 to 2007 to nearly 40,000....

The incidence of PTSD grew last year as more U.S. troops were exposed to combat -- with force levels in Iraq and Afghanistan reaching more than 170,000 and 27,000, respectively. Also contributing were a lengthening of war zone rotations from 12 to 15 months and the rise in the number of troops serving repeated tours, which sharply increases the likelihood troops will experience symptoms of PTSD.