Man, that looks fun…
Gotta love physical tests 
Makes one heck of a racket, and depending on how heavy it is, you can usually feel it a little ways down. When we were doing the catapult testing, they had one of the sleds dressed up like an Army tank, and made a video that circulated aboard, “Here’s what happens when an Army Of One meets Four Acres of Sovereign American Diplomacy.”
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