Preflight Procedure Marine Lance Cpl. Matthew Boyers executes preflight procedures in a KC-130 at Clark Air Force Base, Philippines, April 4, 2019, during Balikatan, an annual U.S.-Philippine exercise. SHARE: Download: Full Size (0.3 MB) Tags: Balikatan, Marine Corps Credit: Marine Corps Lance Cpl. Isaiah Campbell VIRIN: 190404-M-TU241-0213C.JPG Photo Gallery