18. A U.S. Air Force B-2 Spirit Stealth Bomber Refuels From an Illinois Air National Guard KC-135 Stratotanker Over the Pacific Ocean, April 4, 2005. Photo Credit: Master Sgt. Val Gempis, United States Air Force; Defense Visual Information (DVI, http://www.DefenseImagery.mil, DF-SD-07-04347 and 050404-F-1740G-001) and United States Air Force (USAF, http://www.af.mil), United States Department of Defense (DoD, http://www.DefenseLink.mil or http://www.dod.gov), Government of the United States of America (USA).