Medium shot, STAFF Sergeant Tim Leahy, USAF, demonstrates to First Lieutenant Ron Kennedy, USAF, the proper way to place a tail stand on the back of a KC-135 at Grand Forks Air Force Base, North Dakota, on 25 February, 2000. The tail stand is used to balance the aircraft during refueling procedures and is a necessary part of the crew servicing exercise which was taking place on the Charlie ramp at the base. Sergeant Leahy is a Crew CHIEF with the 319th Aircraft Generation Squadron and Lieutenant Kennedy is a Copilot with the 911th Air Refueling Squadron