Airborne "H" Harness w single Pt. release. Used to carry Ruck sacks, and other equipment by attaching the gear to the "D" rings on airborne parachute systems and or MC-4 / MC-5 Military Freefall systems. Here is a video on the proper set up of the "H' harness.
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There are several excellent videos on Youtube demonstrating how to rig the "H' harness.