This is a pretty sweet video showing USAF test parachutists at work. All are jumping the BA-22 (Z variation for test jumps) harness/container system and C-9 28' flat circular round main (one is actually a 35' chute for use on the U-2 Spyplane). "Stuff" seen either dropping away or hanging below the jumper under canopy are survival kit containers (empty shell falling away) and life raft/ survival kit items. Jumpers wear a Butler HX-500 chest mounted belly conical reserve with Cypres AAD. Video shows Thunderbird ejection seat footage, head down terminal round opening, bailout "tuck" body position opening, line over/ mae west malfunction with holes/tears, spring loaded pilot chute "hesitation", 98% perfect PLF (Knees should be together...but who's grading them anyways) and a terminal total malfunction with belly reserve deployment.
The US Army and USAF are the only two services that have current test parachutist. The test parachutist in the USAF comprise mostly of SERE Specialists, Life Support Technicians, and Parachute Riggers.
Learn more about an exciting career as a SERE Specialist:
http://www.gosere.com/
Video:
http://www.youtube.com/watch?v=iCH6PAlNMoA