Gates recently announced that the US Army was going to be increased by 22,000 people. Where he is going to find them, I have no idea. Frankly, with the number of army recruiters committing suicide from stress over the past few years, such an endeavor seems quite dangerous.
It seems these troops are necessary to keep up full rotations in Iraq and Afghanistan over the next three years (even though Iraq troops are coming home)--at least according to Gates.
Frankly, morale may be more hurt by the stresses of trying to recruit these troops than not having enough on the battlefield, and the damage to the US recruiting interface overall may be crushing (though most of the damage has likely already be done, to be completely honest).
But I am not entirely sure Gates is wrong--it is possible that 22,000 troops over three years is an entirely reasonable recruitment goal. I haven't heard congress complain, but they apparently have a more urgent meal on their plate before August.