In a Feb. 16 memo to Gen. George W. Casey, Gen. Martin Dempsey, the commander of the U.S. Army Training and Doctrine Command, says that the Army has lost thousands of uniformed trainers because of troop demands in Iraq and Afghanistan, has had to put junior officers in charge of some key training functions and has delayed initial instruction for nearly 500 pilots because it doesn't have enough trainers.

Only 30 percent of the instructors at Army training schools are in the military, Dempsey says, with the Army increasingly dependent on outside contractors.

"We are behind in integrating lessons learned, developing training and updating doctrine," Dempsey wrote in the memo, a copy of which McClatchy Newspapers obtained. "We are undermanned in our efforts to design the future Army."

Dempsey's warning comes as the Obama administration presses ahead with plans to increase the number of troops in Afghanistan by 30,000 and has committed a growing number of military trainers to doubling the size of the Afghan security forces. Since Dempsey took command of TRADOC in December 2008, the command has sent 889 troops, contractors and civilians to Iraq and 675 to Afghanistan.