The role of the Air Force in Afghanistan is crucial, especially as Taliban forces try to close a supply route through Pakistan's Khyber Pass and Kyrgyzstan seeks to shut a U.S. air base in that country.
Nearly 600 airmen have been killed or wounded in Iraq and Afghanistan since the Sept. 11, 2001, terrorist attacks - and 96 percent of them have been on the ground, according to Air Force officials.
Their mounting losses - partly due to expanded duties off base - prompted intensive training, begun three years ago, to help the ground airmen survive combat.