REFRESHER COURSE U.S. airmen load a mock patient into a CH-47 Chinook helicopter during an emergency medical technician refresher course on Joint Base Lewis-McChord, Wash., April 1, 2012. The airmen are assigned to the 446th Aeromedical Evacuation Squadron. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 431836-R-PGR89-632.jpg Photo Gallery