The two Iowa National Guard members killed in a weekend attack in Syria that the U.S. military blamed on the Islamic State group were identified Monday and remembered as dedicated soldiers.

The U.S. Army named them as Sgt. Edgar Brian Torres-Tovar, 25, of Des Moines, and Sgt. William Nathaniel Howard, 29, of Marshalltown.

Iowa Gov. Kim Reynolds ordered all flags in Iowa to fly at half-staff in their honor, saying, “We are grateful for their service and deeply mourn their loss.”

The Pentagon’s chief spokesman, Sean Parnell, has said a U.S. civilian working as an interpreter also was killed. Three other Guard members were wounded in the attack, the Iowa National Guard said Monday, with two of them in stable condition and the other in good condition.

The attack was a major test for the rapprochement between the United States and Syria since the ouster of autocratic leader Bashar Assad a year ago, coming as the U.S. military is expanding its cooperation with Syrian security forces. Hundreds of American troops are deployed in eastern Syria as part of a coalition fighting IS.

How the attack happened
The shooting Saturday in the Syrian desert near the historic city of Palmyra also wounded members of the country's security forces, and the gunman was killed. The assailant had joined Syria’s internal security forces as a base security guard two months ago and recently was reassigned amid suspicions that he might be affiliated with IS, a Syrian official said.

The man stormed a meeting between U.S. and Syrian security officials who were having lunch together and opened fire after clashing with Syrian guards, Interior Ministry spokesperson Nour al-Din al-Baba said Sunday.

Al-Baba acknowledged that it was “a major security breach” but said that in the year since Assad’s fall, “there have been many more successes than failures” by security forces.

The Army said Monday that the incident is under investigation. Military officials and President Donald Trump have blamed the attack on an IS member.

Trump administration vows retaliation
“Our hearts go out to their families, and we lift them up in prayer for strength and comfort during this time of grief,” Defense Secretary Pete Hegseth said Monday on social media. “The United States of America will avenge these fallen Americans with overwhelming force.”

Trump reiterated his promise of retaliation from over the weekend, telling reporters at the White House on Monday that IS will “be hit hard.”