Two U.S. Air Force C-17 Globemasters III fly at low levels. Two U.S. Air Force C-17 Globemasters III fly at low levels during a combat training mission near Biggs Army Air Field, Texas, on Nov. 18, 2004. The mission is the Composite Force Operations phase of the U.S. Air Force Mobility Weapons School Weapons Instructor Course that employs a realistic scenario requiring the students to plan and execute airdrop, air land and air refueling operations. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 024429-J-LRH12-958.jpg Photo Gallery