1912, The first machine gun mounted on an airplane was tested., 1898, The four-month Spanish-American War was fought., 1955, The USS Nautilus, the world’s first operational nuclear-powered submarine, was put to sea for the first time., 1947, Unconfirmed claims were made that the U.S. military recovered debris and alien bodies from a spaceship crash in Roswell, New Mexico. (The controversy continues to this day.), 1963, The M-16 rifle entered Army service., 1861, The American Civil War began., 1940, C-rations were field tested by the U.S. Army., 1846, A two-year war between the U.S. and Mexico began over the status of Texas., 1980, The F-16 Fighting Falcon entered USAF operational service, 1973, Mandatory military service in the U.S. was discontinued, 2008, Ann Dunwoody became the first woman to achieve four-star rank in the U.S. Military., 1947 (a), The first supersonic flight was made by Capt. Charles “Chuck” Yeager.U.S. military., 1941, The “Tuskegee Airmen” became the first African-American pilots in the U.S. military., 1965, The first American combat troops arrived in Vietnam., 1955 (a), Men were first accepted into the Army and Air Force Nurse Corps..

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