A civilian employee of the U.S. Air Force was arrested over the weekend for allegedly conspiring to transmit and transmitting classified information, making him the fifth person over the last year to be arrested on charges of attempting to leak intelligence.

David Franklin Slater, 63, a retired lieutenant colonel from the U.S. Army who later worked in a classified space at U.S. Strategic Command and held a Top Secret security clearance, was arrested in Nebraska on Saturday on a three-count federal indictment. He allegedly sent messages from around August 2021 to April 2022, revealing classified information about the war in Ukraine to a woman claiming to live in Ukraine.