COLOR CHAMBER Randy Cherland, a metals technician with the U.S. Air Force 57th Components Maintenance Squadron, uses a purge chamber to weld a jet engine augmenter nozzle support on Nellis Air Force Base, Nev., April 16, 2009. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 014640-W-UNW48-983.jpg Photo Gallery