Labor strike at lead and silver mine.
“Faced with a rapidly deteriorating security situation around the aircraft, the C-17 crew decided to depart the airfield as quickly as possible,” the Air Force said.
Human remains were discovered in the wheel well of the C-17 once it returned to Al Udeid Air Base, Qatar. The C-17 is impounded to allow crews to collect the remains and inspect the aircraft before it returns to flight.
https://www.airforcemag.com/usaf-human-remains-on-c-17-leaving-kabul/