An F-22 Raptor from Hill Air Force Base, Utah, prepares to be refueled by a KC-135 Stratotanker assigned to Fairchild AFB, Wash., Feb. 7, 2014. The KC-135 Stratotanker provides the core aerial refueling capability for the U.S. Air Force and has filled this role for more than 50 years. (U.S. Air Force photo/Senior Airman Mary O'Dell)

Airman 1st Class Jordan Gese, a 93rd Air Refueling Squadron boom operator, reviews checklists before refueling another aircraft mid-air, Feb. 7, 2014. The KC-135 Stratotanker can carry a maximum of 200,000 pounds of fuel to transfer at any given time. (U.S. Air Force photo/Senior Airman Mary O'Dell)

Maj. Jason Eddy, a 93rd Air Refueling Squadron KC-135 Stratotanker instructor pilot, begins a pre-flight check with other crew members before a training mission at Fairchild Air Force Base, Wash., Feb. 6, 2014. Pre-flight checks are done to ensure the aircraft is mission-ready. (U.S. Air Force photo/Senior Airman Mary O'Dell)

A B-52H Stratofortess, assigned to the 5th Bomb Wing at Minot Air Force Base, N.D., is refueled by a KC-135 Stratotanker from the 92nd Air Refueling Wing at Fairchild Air Force Base, Wash., Feb. 6, 2014. The KC-135 can transfer up to 200,000 pounds of fuel and can carry up to 83,000 pounds of cargo. (U.S. Air Force photo/Senior Airman Mary O'Dell)

Maj. Jason Eddy, a 93rd Air Refueling Squadron KC-135 Stratotanker instructor pilot, begins a pre-flight check with other crew members before a training mission at Fairchild Air Force Base, Wash., Feb. 6, 2014. Pre-flight checks are done with the help of a ground crew to ensure the aircraft is mission-ready. (U.S. Air Force photo/Senior Airman Mary O'Dell)

F-22 Raptor from Hill Air Force Base, Utah, prepares to be refueled by a KC-135 Stratotanker assigned to Fairchild AFB, Wash., Feb. 7, 2014. The KC-135 Stratotanker provides the core aerial refueling capability for the U.S. Air Force and has filled this role for more than 50 years. (U.S. Air Force photo/Senior Airman Mary O'Dell)

A B-52H Stratofortess, assigned to the 5th Bomb Wing at Minot Air Force Base, N.D., is refueled by a KC-135 Stratotanker from Fairchild Air Force Base, Wash., Feb. 6, 2014. Fairchild is home to more than 30 KC-135s and perform refueling missions worldwide. (U.S. Air Force photo/Senior Airman Mary O'Dell)

Staff Sgt. Jason Markham, 93rd Air Refueling Squadron boom operator, prepares to refuel a B-52H Stratofortress during a routine training mission over North Dakota, Feb. 6, 2014. The basic crew of a KC-135 Stratotanker includes a pilot, co-pilot and boom operator. The B-52H Stratofortess is assigned to the 5th Bomb Wing at Minot AFB, N.D. (U.S. Air Force photo/Senior Airman Mary O'Dell)