according to this source:

The U.S. Army, which is taking the bulk of the casualties in Iraq, is still getting more volunteers than it needs. Standards have remained high, but the numbers needed have gone up as well. With over 6,000 casualties in Iraq during the last year, the number of new troops needed this year has been increased from 72,000 to 77,000. Most of the wounded troops return to duty, but all are out of action for days, or months, or forever in the case of the dead and crippled. This is all uncharted territory for the army, as it has been over 150 years since it was in a long war with an all-volunteer force.

The army has about eleven percent of its total (active and reserve) strength in Iraq, and the casualties are, in a historical first, disproportionately non-combat troops. This means that those joining the army can’t guarantee they will stay away from combat by enlisting for a non-combat job. If you go to Iraq or Afghanistan, you are going to be shot at. Army basic training has been made longer, and more combat oriented as a result.