Update: The Air Force has identified the crewmembers as Capt. Thomas J. Gramith, 27, of Eagan, Minn, and Capt. Mark R. McDowell, 26, of Charlotte, NC. Both were assigned to the 336th Fighter Squadron at Seymour Johnson AFB.  

According to various sources, a USAF F-15E has crashed in Afghanistan, and the two-man crew has been killed.  The crash was reportedly not due to hostile fire.