Athletes line up to participate in the Marine Corps pull-up challenge at the 2017 Penn Relays in Philadelphia, Pennsylvania, on April 28. The Marine set-up includes blow-up drill instructors, branded F-150s, tents, pull-up bars, and a special tractor-trailer. Inside the trailer, participants experience Marine Corps training and life through three segments: a brief introduction video by a Marine Corps drill instructor, a weapons handling section that includes multiple M-4 Carbine rifles, and a brief video that explains what the Fleet Marine Force is. (

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