A C-5 Galaxy from the 167th Airlift Wing at Martinsburg Air National Guard Base, W.V., makes a pit stop at Grand Forks Air Force Base, N.D., for refueling on June 10, 2014. The C-5 Galaxy is one of the largest aircraft in the world and the largest cargo airframe in the Air Force inventory. The C-5 has 12 internal wing tanks with a total capacity of 51,150 gallons of fuel. That's enough to fill 6 1/2 regular size railroad tank cars. (U.S. Air Force photo/Staff Sgt. Luis Loza Gutierrez)