Post was one of the first reporters to file the story of Rudolf Hess parachuting into Scotland in May 1941. He likened Hess' arrival to "something out of a mystery thriller." Post was one of the eight reporters who trained with the United States Eighth Air Force in 1943 in order to fly along on B-24 and B-17 Flying Fortress bomber missions into Germany. After a week of high-altitude training Post flew his first mission on a B-24 Liberator on February 26, 1943. During the raid Post's aircraft encountered German fighter aircraft and was shot down over Oldenburg, Germany. Post and most of the crew did not survive the encounter.