 He was promoted to captain in early April, as well as made squadron operations officer.On April 12 the Eager Beavers flew a mission to Rabaul for which he was awarded an Oak Leaf Cluster to his Silver Star.In May 1942, Zeamer was made squadron executive officer, and took up the upgrading of a B-17E, #41-2666, recently acquired from the 8th Photographic Reconnaissance Squadron, for photographic mapping purposes.