The Pentagon has released the names of four of the six service members who have been killed in the Iran war, saying they died in a drone strike in Kuwait.

All four Army Reserve soldiers were killed when a drone hit a command center in Port Shuaiba, Kuwait on Sunday – just one day after the US and Israel launched its military campaign against Iran, which has launched retaliatory strikes.

All were assigned to the 103rd Sustainment Command in Des Moines, lowa.

Killed were Capt. Cody A. Khork, 35, of Winter Haven, Florida; Sgt. 1st Class Noah L. Tietjens, 42, of Bellevue, Nebraska; Sgt. 1st Class Nicole M. Amor, 39, of White Bear Lake, Minnesota; and Spc. Declan J. Coady, 20, of West Des Moines, lowa.

The remains of two others have also been located, though their identifications have not yet been released. 

A source familiar with the tragedy told CNN that the makeshift command center was struck by a direct hit at the center of the building, which they described as a triple-wide trailer with office space inside, just after 9am local time. 

The attack came very quickly, with no warning or sirens to alert troops to evacuate or get into a bunker, the source added. 

Hours after the attack, the source said, fire was still smoldering in some parts of the building, with the walls blown outwards from the blast. 

The Pentagon has identified four soldiers killed in a drone strike in Kuwait as Capt. Cody A. Khork, 35, of Winter Haven, Florida (left) and Sgt. 1st Class Nicole M. Amor, 39, of White Bear Lake, Minnesota 

Sgt. 1st Class Noah L. Tietjens, 42, of Bellevue, Nebraska, and Spc. Declan J. Coady, 20, of West Des Moines, lowa were also killed

All four Army Reserve soldiers were killed Sunday when a drone hit a command center in Port Shuaiba, Kuwait. Smoke is seen rising from an area surrounding the US Embassy following a strike in Kuwait on Monday

The command center had concrete barriers surrounding it, which is typical for military structures overseas, but nothing that could shield it from drones or missiles, the source said.

Three officials also told CBS News that prior to the attack, there had been discussion on the ground about whether the tactical operations center in question should not have been used as it concentrated too many people in a location that was not easily defended. 

Defense Secretary Pete Hegseth, however, said on Monday that the strike hit a ‘tactical operation center that was fortified.’

He then claimed that there was just ‘one’ projectile that made it through the air defenses. 

The strike on the facility now remains under investigation. 

Capt. Cody A. Khork, 35, of Winter Haven, Florida was among those killed when a drone hit a command center in Kuwait on Sunday

Motorists are seen driving along a street as smoke rose from a reported Iranian strike in an area near where the US Embassy is located in Kuwait City

This is a breaking news story and will be updated.