First Lt. Anh-Vu Nguyen and Capt. Mark Kimball, 9th Expeditionary Bomb Squadron aircrew members, listen to a final brief before heading to their B-1B Lancer at an undisclosed location in Southwest Asia Feb. 26, 2012. The B-1 is flown by a crew of four and carries the largest payload of both guided and unguided weapons in the Air Force inventory. Its 10,000th combat mission supported troops in Afghanistan.