Williams entered flying training in June 1923 at
Brooks Field in
San Antonio. In January 1924, he began advanced flying training at nearby
Kelly Field. In May 1926, Williams was transferred to
France Field in the
Panama Canal Zone, where he served with the
6th Composite Group and the
7th Observation Squadron. There, on 11 November 1927, he was promoted to
first lieutenant. In February 1938, Williams participated in a goodwill tour by six B-17s from Langley Field to
Buenos Aires, Argentina, and back. In November 1939, he took part in a second goodwill flight when seven B-17s of the 2nd Group flew to
Rio de Janeiro, Brazil and back. Williams received the
Order of the Southern Cross from the government of Brazil in 1940 for his participation in the Rio flight. Williams was promoted to
major on 11 March 1940. From September 1940 to 31 January 1941 Williams was detached from the 2nd Bomb Group to act as a military observer in England during
the Blitz. He was wounded during an air raid on London, losing an eye. Upon his return from the UK, Williams resumed duty with the 2nd BG, assigned as group commander in April, upon which he submitted a favorable report on the merits of the
Royal Air Force's operational training (OTU) system, based on his observations, to the Training and Operations Division of the Office of Chief of Air Corps. Promoted to
lieutenant colonel on 8 November 1941, he was still in command of the 2nd BG when the
Japanese attacked Pearl Harbor and brought the United States into World War II. Williams was immediately moved to staff duty at the headquarters of the
First Air Force at Mitchel Field on 10 December 1941, assigned to the I Bomber Command, and was promoted to
colonel on 1 March 1942. ==World War II==