ELLSWORTH AIR FORCE BASE, S.D. -- Capt. Kaylene Giri, 34th Bomb Squadron B-1B Lancer weapons systems officer instructor, proceeds through a weapons system preflight checklist, Oct. 15. As a weapons systems officer, Captain 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)