The Department of War identified on Tuesday four of the six U.S. service members killed in Iran’s retaliatory attacks in response to the U.S. and Israeli strikes against the country this weekend.

The Pentagon identified the four deceased Army Reserve soldiers as Capt. Cody A. Khork, 35; Sgt. 1st Class Noah L. Tietjens, 42; Sgt. 1st Class Nicole M. Amor, 39; and Sgt. Declan J. Coady, 20. The DOW statement said they died on March 1 in Port Shuaiba, Kuwait, during a drone strike and that the incident is under investigation.