CHARLES LIVINGSTON BULL (1874-1932) JOIN THE ARMY AIR SERVICE / BE AN AMERICAN EAGLE! Circa 1917. 26 3/4x20 1/4 inches, 68x51 1/2 cm. Alpha Litho Co. Inc., New York. Condition B+ / B: repaired tears, replaced losses, creases and restoration at edges and along vertical and horizontal folds; repaired pin holes and abrasions in corners; faded. Framed. On May 24, 1918, President Wilson removed responsibility for American military aviation from the Signal Corps and placed it within two agencies under the supervision of the U.S. Army: The Bureau of Aircraft Production and the Division of Military Aeronautics. These two branches were officially recognized as the U.S. Army Air Service. Rawls p. 173, Theofiles p. 35, Borkan p. 41, War Posters 116, Pollack 12.