TYB
Looks like the United States Air Force Academy just took up some parachutists. Twin Otter is now back down at lower altitude but top of flight path shows around 11,400 feet. Call Sign CONGO63 and tail number 82-23835.
DeHavilland of Canada UV-18A Twin Otter 82-23835 is based at the Air Force Academy.
http://www.air-and-space.com/20120413%20Davis-Monthan.htm
Qualifier: I am a master parachute rigger and taught sport skydiving for 10 years. Standard jump altitude is 12,000 feet AGL - this is one turn of the standard parachutist's altimeter. This height provides 1 minute of freefall, is within reach of a Cessna with a decent engine and does not require supplementary oxygen.
https://answersdrive.com/how-long-does-it-take-to-skydive-from-12000-feet-3755942
And look who just flew into the picture, kek.