"What you do only when you're desperate."

USA Today:

About 8,000 sailors are on the ground in Iraq and Afghanistan, according to Rear Adm. David Gove, head of the Navy Personnel Command. By the end of the year, that number is expected to grow to as many as 12,000, he says.

Gove says it makes sense to tap into a broader pool of talent. "There is a realization of capability in other parts of the services that we need to leverage," he says.

The Air Force has not said how many airmen are doing Army jobs.

Army spokesman Lt. Col. Carl Ey says the training gives commanders more flexibility and doesn't signal a shortage of soldiers.

Andrew Krepinevich, a military analyst with the Center for Strategic and Budgetary Assessments, counters: "If the Army wasn't having recruiting challenges and exceeding rotation rates, we wouldn't be having this discussion."

Krepinevich authored a Pentagon-sponsored report earlier this year that found extended deployments were straining the military.

Frederick Kagan, a military historian at the American Enterprise Institute, says training sailors and airmen to do the jobs of seasoned soldiers is "what you do only when you're desperate."