The 30th Bombardment Squadron was originally organized on 13 June 1917, at Kelly Field, Texas, as the 30th Provisional Aeronautical Squadron, and redesignated the 30th Aeronautical Squadron on 28 June 1917. The 30th Aeronautical Squadron left the U.S. on 23 August 1917, on the U.S. Steamship "Baltic". They did not participate in combat however, and returned to the U.S. on 4 April 1919, and were disbanded at Garden City, Long Island, New York, on 14 April 1919. On 24 March 1923, the Squadron was reconstituted as an inactive unit and made active again on 22 June 1932 as part of the 19th.

28th, 32nd, 93rd, 435th, 912th