Began its association with testing when it received the first of the five Boeing YB-9, first all-metal monoplane bomber aircraft designed for the United States Army Air Corps, on 14 September 1932. The new bomber proved impossible to intercept during air exercises in May 1932, strengthening calls for improved air defense warning systems. Received the first of 12 Boeing B-17 Flying Fortresses delivered to the U.S. Army Air Corps. Participated in good-will flights to Argentina, 15–27 February 1938, Colombia, 3–12 August 1938, Mexico, 9–15 June 1939, and Brazil, 10–28 November 1939. The trip to Buenos Aires represented the longest distance performance of its kind on record and won the 2nd Bombardment Group the Mackay Trophy in 1938. Following 24 January 1939 Chillán earthquake in Chile, the XB-15, a prototype aircraft that had been assigned to the squadron to test the feasibility of operating very heavy bombers, flew a relief mission carrying medical supplies. Commanded by Major Caleb V. Haynes, the aircraft carried of American Red Cross emergency supplies to Santiago, making only two stops along the way, at France Field in the Panama Canal Zone, and at Lima, Peru. Haynes was awarded the Distinguished Flying Cross and the Order of the Merit of Chile, and the whole crew earned the MacKay Trophy.