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Active military duty (1941–1942)

Johnson reported to General Douglas MacArthur in Australia. Johnson and two U.S. Army officers went to the 22nd Bomb Group base, which was assigned the high-risk mission of bombing the Japanese airbase at Lae in New Guinea. On June 9, 1942, Johnson volunteered as an observer for an airstrike on New Guinea. Reports vary on what happened to the aircraft carrying Johnson during that mission. MacArthur recommended Johnson for the Silver Star for gallantry in action; the citation indicated that the mission came under attack and Johnson's aircraft experienced mechanical problems, forcing it to turn back before reaching its objective. Others claim that the aircraft turned back because of generator trouble before encountering enemy aircraft and never came under fire, an account that is supported by the aircraft's official flight records. Other airplanes that continued came under fire near the target about the same time Johnson's plane was recorded as having landed back at the original airbase. Johnson's biographer Robert Caro was quoted as saying "I think that the weight of the evidence at this moment is that the plane was attacked by Zeroes and that he was cool under fire", but also "The fact is, LBJ never got within sight of Japanese forces. His combat experience was a myth."