The Pentagon released the final two names of the six US service members killed in Sunday’s drone attack in Kuwait on Wednesday, identifying them as Chief Warrant Officer 3 Robert Marzan, 54, of Sacramento, California, and Maj. Jeffrey O’Brien, 45, of Indianola, Iowa.

According to the department of defence, Marzan was present at the command center in Port Shuaiba when the strike occurred and is believed to have perished at the scene, pending final confirmation by a medical examiner. Major O’Brien, a signal officer and information systems engineer, had a two-decade career in cybersecurity.

The four other soldiers, previously identified on Tuesday, were:

Sgt. Declan Coady, 20, of West Des Moines, Iowa (posthumously promoted from Specialist)

Sgt. 1st Class Nicole Amor, 39, of White Bear Lake, Minnesota

Capt. Cody Khork, 35, of Winter Haven, Florida

Sgt. 1st Class Noah Tietjens, 42, of Bellevue, Nebraska

All six victims were members of the 103rd Sustainment Command, an Army Reserve unit that provides critical logistics and supplies.

The fatal strike occurred just one day after the US and Israel launched “Operation Epic Fury” against Iran, which triggered retaliatory drone and missile attacks across the Gulf.