One way in, one way out

Master Sgt. Zach Kuno, 141st Maintenance Squadron, Aircraft Fuel Systems supervisor, enters a fuel tank on a KC-135 Stratotanker while wearing a respirator and anti-static suit at Fairchild Air Force Base, Washington, Nov. 21, 2017. The atmosphere in and around a fuel tank must be kept at safe levels of no more than 10 percent fuel vapor and oxygen levels between 19.5 and 23.5 percent to minimize health and fire risks. (U.S. Air Force photo/Senior Airman Ryan Lackey)

PHOTO BY: SrA Ryan Lackey
VIRIN: 171204-F-HU835-013.JPG
FULL SIZE: 4.78 MB
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