How do some people still Jump even though they are not in an Airborne Unit?

It's called permissive parachuting. Your commanding general as to sign off on you jumping. You won't receive any pay and your jump log will not be reopened

At Fort Bragg, there were fun jumps for those not in AB units or that just wanted more jumps. I am a leg, but remember one when I was with USASOC in the former post stockade. The USAF violated their lease on Pope Field by having F or P aircraft stationed there, in this case F16s. Some F-16 crashed into a transport and caused havoc, we heard it over at USASOC, but just thought it to be the 10th Marines shooting out of the impact area. We had to do a 100% confirmation of our people to make sure we did not have any strap hangers involved. That night at Willie's the DFAE proclaimed that he would have the AF kicked out of Pope for violating their lease. DA intervened, and it was years later the AF was thrown out and Pope was again Pope AAF.