Senior Master Sgt. Robert Bertsch, an Air Force Reserve loadmaster assigned to the 728th Airlift Squadron, Joint Base Lewis-McChord, Washington, performs pre-flight checks on a C-17 Globemaster III during a local mission here on April 27, 2020. The local sortie included a combat offload and additional training to keep pilots and loadmasters combat ready. (Air Force photo by Maj Candice Allen)
18.0-200.0 mm f/3.5-5.6
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