An airman stationed at Joint Base Elmendorf-Richardson in Alaska died on Nov. 6 while training in the Republic of Korea, according to a JBER news release.

Airman 1st Class Darrick Jones was on temporary assignment in Korea to train allies when he collapsed and died. Other airmen performed first aid on Jones but were unable to revive him, the release said.

The 23-year-old joined the Air Force in 2015 and was assigned to JBER in August 2016. He was a water and fuels systems apprentice with the 773rd Civil Engineering Squadron.

“The grief felt as a result of the loss of Airman 1st Class Jones cannot be overstated,” Col. George T.M. Dietrich, commander of the 673d Air Base Wing, said in the release. “On behalf of everyone at Joint Base Elmendorf-Richardson, I offer our most sincere condolences to the family and friends. JBER is a close-knit team and when a tragedy like this occurs it affects us all.”

An investigation is underway to determine the cause of death.