Staff Sgt. Daniel Guerra looks for fuel leaks in an F-16 fighter engine. Air Force Staff Sgt. Daniel Guerra looks for fuel leaks in an F-16 fighter engine running at full afterburner in the test cell facility at Osan Air Base, Korea, on Aug. 23, 2004. Guerra is an engine propulsion mechanic with the 51st Maintenance Squadron at Osan. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 951221-M-QRT48-293.jpg Photo Gallery