Tech. Sgt. Eric Knight, 62nd Aircraft Maintenance Squadron, adjusts his helmet chin strap after donning his gas mask during a mobility exercise Oct. 18, 2011, at Joint Base Lewis-McChord, Wash. The 62nd Airlift Wing and 627th Air Base Group conducted a mobility exercise, or MOBEX, from Oct. 14 to 21. (U.S. Air Force illustration/Staff Sgt. Frances Kriss)
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