Air Force Staff Sgt. Gerald Marvel, an aerospace ground equipment technician assigned to the 452nd Maintenance Squadron, tightens a bolt on the king valve of the refrigeration system inside an MA3D trailer mounted air conditioner during inspection at March Air Reserve Base, Calif., March 22, 2010. Val Gempis

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Keywords: .., age, air, aircraft, california, defense, force, ma3d, maintenance, military, riverside, united, war