Good declined to say how Welsh's body was found or if foul play has been ruled out because the investigation into the death is ongoing.
Because the case is open, no details about the investigation are releasable, said Linda Card, a spokeswoman for the Air Force Office of Special Investigations.
"Kevin was a proud Defender of the Wolf Pack," Lt. Col. Ian Dinesen, 8th Security Forces Squadron commander, said in a news release. "Our squadron is grieving this tragic loss along with his family back home. He will surely be missed here at Kunsan."