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Pennsylvania Air National Guardsman Tech. Sgt. Michael Bullister assigned to the 171st Air Refueling Wing briefs a group of Vietnam veterans about some of the equipment used by pilots in the event of an aircraft emergency. The veterans toured the Pennsylvania Air National Guard unit in celebration of their 50th anniversary of graduating from Officer Candidacy School. (U.S. Air National Guard photo by Staff Sgt. Bryan Hoover)
28.0-300.0 mm f/3.5-5.6
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