As the U.S. enters the third year of its war in Iraq, there is mounting concern about its impact on the health of the American armed forces. In late January, The Associated Press leaked a November report that military affairs analyst Andrew F. Krepinevich prepared for the Pentagon which warned that "the Army simply cannot sustain the force levels … needed to break the back of the insurgency movement." Unless the stress on the "thin green line" is relieved, Krepinevich warned, Iraq risks "breaking" the Army.

http://www.armedforcesjournal.com/2006/03/1814016