The Army has become increasingly focused on delivering supplies by air to Afghanistan, but challenges remain, according to a top service logistics official. Lt. Gen. Mitchell Stevenson, the deputy chief of staff for Army logistics (G-4), said today that the Army has dramatically increased the number of airdrops it conducts. "Airdrop has become big business for us," he said at a breakfast in Washington sponsored by the Association of the U.S. Army. More specifically, Stevenson said the Army three years...