Staff Sgt. Pedro Melendez performs preflight checks. U.S. Air Force Staff Sgt. Pedro Melendez, a flight engineer with the 1st Helicopter Squadron, performs preflight checks on a UH-1 Huey helicopter at Andrews Air Force Base, Md., on March 24, 2009. SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 889510-E-XNT39-937.jpg Photo Gallery