Four out of the six crew members aboard a U.S. refueling aircraft that ​crashed in western Iraq have been killed, the U.S. ‌military confirmed Friday. Search-and-rescue efforts are ongoing for the remaining two personnel. “The circumstances of the incident are under investigation. However, the loss of the aircraft was not due to hostile fire or friendly fire,” read a statement from U.S. Central Command Friday morning. The identities of the service members are being withheld until 24 hours after