KNOXVILLE, Tenn. (WATE) – A U.S. Army soldier from Knoxville was one of 13 American service members killed in an attack outside Kabul’s airport Thursday, according to his family.

Photo provided by the Knauss family

U.S. Army Staff Sgt. Ryan Knauss was a graduate of Gibbs High School. Knauss’s grandfather Wayne Knauss said Friday that the 23-year-old was among the fatalities when a suicide bomber and gunmen attacked Thursday outside Kabul’s airport during the evacuation of American forces and allies.

“He grew up in a Christian home, attended Berean Christian school through 8th grade and spent, 4 years at Gibbs High,” said Wayne Knauss about his grandson. “A motivated young man who loved his country. He was a believer so we will see him again in Gods heaven.”

Stepmother Linnae Knauss said Ryan was looking forward to coming back to the states and moving to Washington D.C.

“He was a super-smart hilarious young man,” she said.

Knauss was stationed at Fort Bragg in North Carolina. On Friday, the 1st Special Forces Command tweeted “Our teammate died not only serving our nation, but helping to give others a life of freedom and opportunity.”

Wayne Knauss said his grandson served for 5 years with special training in Psychology Operations. The family received word Friday morning. Funeral services will be shared once they are planned.

“Ryan gave his life outside that airport helping people he didn’t know get to safety. This is what true heroism looks like and Ryan’s sacrifice will never be forgotten. The Knauss family is in my prayers.” tweeted U.S. Representative Tim Burchett, of Knoxville who represents Tennessee’s Second Congressional District.

The attacks killed at least 60 Afghans and 13 U.S. troops, Afghan and U.S. officials said. Eighteen service members were wounded and officials warned the toll could grow. More than 140 Afghans were wounded, an Afghan official said.

President Joe Biden vowed to finish the evacuation efforts and avenge the deaths of American servicemembers in an address to the nation Thursday evening, declaring to the extremists responsible, “We will hunt you down and make you pay.”

Secretary of Defense Lloyd J. Austin III issued a statement expressing his deepest condolences for the military members who died in the attack.

Marine Gen. Kenneth McKenzie Jr. said Thursday the military believes the complex attack outside Kabul airport was carried out by ISIS-K, a splinter group of the terrorist group ISIS, adding the military will “go after” the perpetrators of the Kabul attacks if they can be found.

“We expect these attacks to continue,” he said, adding that Taliban commanders have been asked to take additional security measures to prevent another suicide bombing on the airport’s perimeter. He said he sees no indication that the Taliban allowed Thursday’s attacks to happen.