Gas Mask
SrA Stephanie Kern, bioenvironmental technician, in background, watches as 2nd Lt. Michael Palmer, puts on a MCU-2A/P gas mask on so she can run a fit test for him. The protection assessment for a military gas mask must register at least 2000 for Air Force standards. That means the air inside the mask is that much cleaner than the air outside. U. S. Air Force photo by Sue Sapp