20th Pursuit Group at Barksdale Field, Louisiana. On 28 July 1938, he became aide-de-camp to Brigadier General Frederick L. Martin, the commanding general of the 3rd Wing at Barksdale Field, and he continued in this role when Martin was promoted and assumed command of the Hawaiian Air Force at Fort Shafter in the Territory of Hawaii, with the rank of major as of 22 July 1941. World War II After the Japanese attack on Pearl Harbor on 7 December 1941, Landry became the executive officer of the Hawaiian Interceptor Command at Honolulu, which soon became the VII Interceptor Command, and then the VII Fighter Command. In April 1942, he transferred to the newly formed Eighth Air Force as the Assistant Chief of Staff, A-3 (Operations), of the VIII Fighter Command, and then chief of its Combat Operations Division from 1 January to 29 October 1943. He commanded the 56th Fighter Group from 30 October 1943 to 12 January 1944. He was then Assistant Chief of Staff, A-3 (Operations) for fighters of the Eighth Air Force until 26 November 1944. He was promoted to lieutenant colonel on 23 January 1942, and colonel on 29 December 1942. For his services, he was awarded the Distinguished Flying Cross with an oak leaf cluster and the Air Medal with four oak leaf clusters. Switching to bombers, Landry was executive officer of the 93rd Combat Bombardment Wing from 27 November 1944 to 14 February 1945 and commanded the 493rd Bombardment Group from 15 February to 6 June 1945. He was also the acting commander of the 93rd Combat Bombardment Wing from 14 to 29 March 1945. On 7 June he became the Assistant Chief of Staff, A-3 (Operations), on the air staff of the Supreme Headquarters Allied Expeditionary Force (SHAEF) at Frankfurt, Germany. He subsequently served as an air advisor to the Theater General Board. While in the European theater during World War II he flew 32 combat missions in P-47 fighters and Boeing B-17 Flying Fortress bombers. Post-war Landry returned to the United States, where he was a member of the Joint Operations Review Board at the Army and Navy Staff College from 1 January to 30 June 1946. He then became an instructor at the National War College in Washington, D.C., from 1 July 1946 to 30 June 1947. He was executive officer to the chief of staff, Headquarters United States Air Force