WASHINGTON (AP) — President Donald Trump is traveling to Dover Air Force Base in Delaware on Wednesday for a dignified transfer for the two Iowa National Guard members killed in an attack in the Syrian desert that is testing the rapprochement between Washington and Damascus.

The two guardsmen killed in the attack on Saturday were Sgt. Edgar Brian Torres-Tovar, 25, of Des Moines, and Sgt. William Nathaniel Howard, 29, of Marshalltown, according to the U.S. Army. Both were members of the 1st Squadron, 113th Cavalry Regiment. A U.S. civilian working as an interpreter was also killed.

The ritual at Dover Air Force Base honors U.S. service members killed in action and is one of the most solemn duties undertaken by the commander in chief.

During the process, transfer cases draped with the American flag holding the remains of fallen soldiers are carried from the military aircraft that carried them to Dover to an awaiting vehicle to transport them to the mortuary facility at the base. There, the fallen service members are prepared for their final resting place.

Trump, a Republican, said during his first term that witnessing the dignified transfer of service members’ remains is “the toughest thing I have to do” as president.

Remembered as ‘the best of Iowa’

The Iowa National Guard is remembering the two men as heroes. Howard’s stepfather, Jeffrey Bunn, said Howard “loved what he was doing and would be the first in and last out,” noting that he had wanted to be a soldier since he was a young boy.

In a post on the Meskwaki Nation Police Department’s Facebook page, Bunn – who is chief of the Tama, Iowa, department – called Howard a loving husband and an “amazing man of faith” and said Howard’s brother, a staff sergeant in the Iowa National Guard, would escort “Nate” back to Iowa.

Torres-Tovar was remembered as a “very positive” person who was family oriented and someone who always put others first, according to fellow guardsmen who were deployed with Torres-Tovar and issued a statement to the local TV broadcast station WOI.

“They were dedicated professionals and cherished members of our Guard family who represented the best of Iowa,” said Maj. Gen. Stephen Osborn, adjutant general of the Iowa National Guard.

Trump stands by Syrian leader al-Sharaa

On Saturday, Trump told reporters that he was mourning the deaths and vowed retaliation.

Trump said Monday that he remained confident in the leadership of interim Syrian President Ahmed al-Sharaa, the onetime leader of an Islamic insurgent group who led the ouster of former President Bashar Assad, whose family had an iron grip on Syrian rule for decades.

The U.S. president welcomed al-Sharaa to Washington last month for a historic visit to the White House and formally welcomed Syria as a member of the U.S.-led coalition to fight the Islamic State group. Hundreds of U.S. troops are deployed in eastern Syria as part of a coalition fighting IS.

“This had nothing to do with him,” Trump told reporters in the Oval Office on Monday. “This had to do with ISIS.”

Three other members of the Iowa National Guard were injured in the attack. As of Monday, two were in stable condition and the other in good condition. The Pentagon has not identified them.

Trump traveled to Dover several times during his first term to honor the fallen, including for a U.S. Navy SEAL killed during a raid in Yemen, for two Army officers whose helicopter crashed in Afghanistan and for two Army soldiers killed in Afghanistan when a person dressed in an Afghan army uniform opened fire.