Sgt. Maj. Jeff Johnson rotates a blade during pre-flight on a CH-47 Chinook helicopter from the Illinois Army National Guard, 2nd Battalion, 238th General Support Aviation Battalion, Peoria, Ill., in support of Operation Northern Strike at Alpena Combat Readiness Training Center, Mich., Aug 5, 2014. Operation Northern Strike 2014 is a joint multinational combined arms training exercise conducted in Michigan. (U.S. Air National Guard photo by Master Sgt. Scott Thompson/released)
Master Sgt. Scott Thompson
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