B-1s at Ellsworth
Capt. Kaylene Giri, a 34th Bomb Squadron weapons systems officer instructor at Ellsworth Air Force Base, S.D., proceeds through a preflight checklist at her WSO crew station in a B-1B Lancer Oct. 15, 2009. Capt. Giri, along with another WSO and the two pilots, perform pre-flight checks to ensure all systems are functioning before every mission. (U.S. Air Force photo/Airman 1st Class Corey Hook)