Today in World War II History—Apr. 22, 1943 POSTED: Sunday, April 22, 2018 by Sarah Sundin US Navy PBY Catalina on patrol, 1942-43 (US Navy photo) 75 Years Ago—Apr. 22, 1943: US Navy PBY Catalinas based in Iceland and Greenland drive off U-boats threatening Allied convoy HX-234.