Three other US service members were injured in the attack.
The Americans killed include:
Army Chief Warrant Officer 2 Jonathan R. Farmer, 37, was from Boynton Beach, Florida. He was assigned to 3rd Battalion, 5th Special Forces Group (Airborne), at Fort Campbell, Kentucky.
He joined the Army in 2005. Farmer served on six overseas combat tours, including in Iraq, Afghanistan and Syria, the US Army Special Operations Command said.
He served in Operation Iraqi Freedom in 2007 and 2009, Operation New Dawn in 2010, Operation Enduring Freedom in 2012 and Operation Inherent Resolve in 2018 and 2019.
His awards include a Bronze Star, a Purple Heart and a Global War on Terrorism Expeditionary Medal.
Farmer is survived by his spouse, four children, and his parents.
Navy Chief Cryptologic Technician (Interpretive)Shannon M. Kent, 35, was from upstate New York. She was a sailor assigned to Cryptologic Warfare Activity 66, based at Fort George G. Meade, Maryland.
«She was a rock star, an outstanding Chief Petty Officer, and leader to many in the Navy Information Warfare Community,» said Cmdr. Joseph Harrison, commanding officer of CWA-66.
She enlisted in the Navy in 2003. Her awards include the Navy/Marine Corps Commendation Medal, the Army Commendation Medal and the Iraq Campaign Medal, according to the US Fleet Cyber Command/US Tenth Fleet.
«Chief Kent’s drive, determination and tenacity were infectious. Although she has left us way too soon, she will not be forgotten, and her legacy will live on with us,» said CWA 66 Command Senior Enlisted Leader, Senior Chief Cryptologic Technician (Collections) Denise Vola.
Civilian Scott A. Wirtz, 42, of St. Louis, Missouri, was assigned to the Defense Intelligence Agency as an operations support specialist, DIA said.
Wirtz enlisted in 1997. He served in the US Navy and as a US Navy SEAL for 10 years.
He had been employed at DIA for nearly two years and completed three deployments for the agency in the Middle East, DIA said.
Wirtz worked as an intelligence expert in Syria with the troops hoping to collect information about security and adversaries in the area.
His awards include the SEAL Insignia, Navy and Marine Corps Achievement Medal and the Secretary of Defense Medal for the Global War on Terrorism.
«We are deeply saddened by the loss of this patriot,» said DIA Director Lt. Gen. Robert P. Ashley, Jr. «This is a stark reminder of the dangerous missions we conduct for the nation and of the threats we work hard to mitigate. As President Lincoln described on the fields at Gettysburg, this officer gave the last full measure of devotion.»