The US military has confirmed the identities of all six soldiers killed in the conflict with Iran.

They were killed when an "unmanned aircraft system" evaded air defences to hit a command centre in Port Shuaiba, Kuwait, on Sunday.

US Central Command initially said three soldiers died in the attack, but officials confirmed on Monday the death toll had doubled, after one person succumbed to injuries and two more bodies were found in the rubble.

Those killed were Chief Warrant Officer 3 Robert M Marzan, 54, Maj Jeffrey R O'Brien, 45, Capt Cody Khork, 35, Sgt Noah Tietjens, 42, Sgt Nicole Amor, 39, and Sgt Declan Coady, 20, who was posthumously promoted from specialist.

The six identified by the Pentagon were members of the Army Reserve, which, according to its website, provides logistical support to broader US military operations.

Four were identified on Tuesday, while the identities of the last two - Marzan and O'Brien - were disclosed on Wednesday.

"These men and women all bravely volunteered to defend our country, and their sacrifice will never be forgotten," US Army Secretary Daniel Driscoll said in a statement.

White House Press Secretary Karoline Leavitt said on Wednesday that President Donald Trump intends to attend "the dignified transfer of these American heroes to stand in grief alongside their families".

She added that the defence department was scheduling the repatriation of the remains.

Khork had previously deployed to Saudi Arabia, Guantanamo Bay and Poland.

The Florida resident had wanted to serve in the military since a young age, and enlisted in the Reserve Officers' Training Corps (ROTC) programme at his university, his family told the Associated Press.

Khork was "truly the life of the party, known for his infectious spirit, generous heart, and deep care for those who served alongside him and for everyone blessed to know him", his mother, Donna Burhans, father, James Khork, and stepmother, Stacey Khork, said in a statement.

Amor, of Minnesota, had previously deployed to Kuwait and Iraq.

"She was almost home," her husband, Joey Amor, told the AP. "You don't go to Kuwait thinking something's going to happen, and for her to be one of the first – it hurts."

She had a son in high school and a daughter in primary school, and enjoyed gardening and rollerblading with them.

Tietjens, a Nebraska resident, had been deployed to Kuwait twice before.

He was "a deeply committed husband and father", according to a GoFundMe page set up for his family.

He earned a black belt in Taekwondo and in a martial art known as Philippine Combatives, according to the Philippine Martial Arts Alliance, which posted a tribute to Tietjens on its Facebook page.

"He did not simply wear a Black Belt... he lived it," the alliance wrote. "He led with integrity. He trained with purpose. He taught with humility."

All three were decorated service members.

Coady was posthumously promoted from specialist, the US military said.

The Iowa resident had enlisted in the Army Reserve just three years ago.

He served as an information technologies specialist and had "an incredibly bright future ahead of him", Drake University, where Coady had studied, said in a statement.

His father, Andrew Coady, told the AP that his son "was very good at what he did".

"I still don't fully think it's real," said his sister Keira Coady. "I just remember all of our conversations about what he was going to do when he came back."

O'Brien of Indianola, Iowa, joined the reserves in 2012 and deployed to Kuwait in 2019.

The identity of Marzan, of Sacramento, California, must still be formalised by a medical examiner, the army said in a statement.

US Defence Secretary Pete Hegseth said in a briefing on Monday that a "powerful weapon" had struck a "tactical operations centre that was fortified".

Three US military officials with knowledge of Iran's attack told the BBC's US partner CBS the soldiers had been working in a makeshift office space.

The officials questioned whether the building had been adequately fortified, telling CBS the soldiers were using a trailer shielded by steel-reinforced concrete barriers.

The US has a long-standing defence relationship with Kuwait, and more than 13,000 US soldiers are stationed in the Gulf nation.

Iran has responded to attacks against it by launching missiles at Gulf countries allied with the US. Bahrain, UAE, Saudi Arabia, Oman and Qatar have all also seen strikes.