That's my seeker harness. It looks a little different than BM's but functions pretty much the same. A couple of Velcro straps wrap around your ribs and secure to the front. Then the parachute clips are fed through slots in the flak vest (ones that you have to cut) and then fed again through the slots in the backplate. I have to have a handler do that for me as it's not possible to reach around your back.