“A U.S. military refueling aircraft crashed in western Iraq on Thursday, in an incident the military said involved another aircraft but was not the result of hostile or friendly fire.
The deaths add to the seven U.S. service members who have already been killed as part of U.S. operations against Iran which began on February 28.”
https://www.yahoo.com/news/articles/four-us-members-killed-plane-094429672.html