ELLSWORTH AIR FORCE BASE, S.D.--Capt. Kaylene Giri, 34th Bomb Squadron B-1B Lancer weapons systems officer instructor, proceeds through a weapons system pre-flight checklist, Oct. 15. As a weapons systems officer, Capt. Giri works with the pilots and other weapons systems officers to collectively achieve and maintain crew efficiency, situational awareness and mission effectiveness. (U.S. Air Force photo/Airman 1st Class Corey Hook)