The US military has identified a third service member believed to have been killed in last week's Iranian attack on a military base in Jordan as Sgt. Angel S. Rampersad, 28, of New York.

The confirmation raises the number of US service members killed since the war began to 18.

Earlier, the Pentagon identified 1st Lt. Tyler James Feehan, 25, of Ewa Beach, Hawaii, and Pvt. Isabella Gonzales, 19, of Carrollton, Texas, as the two other soldiers killed in Friday's missile and drone attack on the base in Jordan.

The soldiers died in Iranian ballistic missile and drone strikes, marking the first US troop deaths from direct Iranian fire since the early days of the conflict. They had been deployed as part of a US mission against the Islamic State group, according to a US Central Command statement.

Following the attack, US Central Command said two service members had been killed and another was missing. A day later, it announced that unidentified human remains had been recovered and that efforts were underway to confirm their identity.

The Pentagon now believes those remains are Rampersad's. Her official status has been changed to "Duty Status–Whereabouts Unknown," and she is considered "believed to be deceased."

Rampersad served in the same unit as Gonzales — the 10th Army Air & Missile Defense Command based in Ansbach, Germany.

Separately, the military identified another US soldier killed in Iraq as Sgt. Michael Emmanuel Swinton, a 30-year-old father from North Carolina, who died during the controlled detonation of an Iranian drone, according to a military statement released Tuesday and his family.

Swinton will be awarded the Bronze Star, Purple Heart and Combat Action Badge and will be promoted posthumously to staff sergeant. The Army said it is investigating the circumstances surrounding his death on Sunday at an air base in Irbil.

He is survived by his wife and two children — a 6-year-old son and a 4-year-old daughter.

"I will never recover from this," his wife, Mia Gonzalez-Swinton, wrote on Facebook on Monday. "We had so many plans for when you got back. I'm sick to my stomach." She said she was informed of his death on Sunday.

Swinton's mother, Christel Swinton Andujar, told The Associated Press that his wife and children were the centre of his life.

"His legacy will live on through the countless lives he touched, the laughter he shared, the strength he gave others, and the unconditional love he poured into his family," she said. "He will forever be missed, forever honored, and forever our hero."

Swinton enlisted in the US Army in 2017 and was assigned to the 55th Air Defense Artillery Regiment, 108th Air Defense Artillery Brigade, based at Fort Bragg, North Carolina.

He lived in Spring Lake, a community near Fort Bragg popular with military families, according to public records. The Army listed his hometown as nearby Fayetteville.

"Sgt. Swinton was an experienced noncommissioned officer who took great pride in his work and the people around him," said Brig. Gen. John L. Dawber, commanding general of the Army Air and Missile Defense Command. "He answered the call to duty with courage, honor and selfless dedication."

The renewed fighting between the United States and Iran has now entered its 10th day, with both sides continuing to exchange strikes. Iran has also targeted US allies in the region, where thousands of American troops remain deployed.

Iranian authorities say US strikes over the past three weeks have killed at least 50 people and wounded more than 500 others.

Both sides have also targeted civilian infrastructure used by millions of people. The conflict has claimed the lives of ship workers, foreign workers and civilians in Gulf countries, Israel and Lebanon.

The US State Department has issued a fresh warning to American citizens, saying that "Iran and groups supportive of Iran may target other US interests overseas or at locations associated with the United States and Americans throughout the world."

President Donald Trump has defended the military campaign, saying it is necessary to prevent Iran from developing nuclear weapons. However, he is facing growing political pressure to end the conflict and avoid a prolonged Middle East war, a scenario he had pledged to avoid during his election campaign. The escalation has also driven global oil prices higher in recent weeks.