Some Spec Ops folks onboard according to this report:
Six of the Marines and the Navy corpsman were assigned to the Marine Raiders, an elite special operations force. They belonged to the Second Marine Raider Battalion, based at Camp Lejeune in North Carolina, according to Maj. Nicholas Mannweiler, a spokesman for the Marine Corps Special Operations Forces.
Major Mannweiler said the Raiders were scheduled to conduct “routine” training in Yuma, Ariz., lasting a few days to a couple of weeks, for small teams preparing for deployment overseas. He would not comment on when or where they were to be sent, but the Raiders are assigned to Central Command, which conducts operations in the Middle East, South Asia and Central Asia, including Afghanistan and Iraq.
https://www.nytimes.com/2017/07/11/u...ane-crash.html