Montgomery served as head of the Flight Division in the
Bureau of Aeronautics in the Navy Department from July 1939 until June 1940, when he assumed command of
Ranger. In June 1941 he became Chief of Staff and Aide to the Commander Aircraft,
Atlantic Fleet, subsequently redesignated Commander Carriers, Atlantic Fleet, Rear Admiral
Arthur B. Cook. He was serving in this post when the United States entered
World War II after the
bombing of Pearl Harbor in December 1941. In this role, he was preoccupied with hunting and sinking German
U-boats in the Atlantic. Promoted to rear admiral in May 1942, Montgomery became commander of the
Naval Air Station Corpus Christi in June, and then the Naval Air Training Center there in November. For his service at Corpus Christi, he was awarded the
Legion of Merit. His citation read: In August 1943 he became commander of Carrier Division 12, flying his flag on . AS such he led the raid on
Wake Island on 5–6 October 1943, his force being designated
Task Force 14. He became commander of Carrier Division 3 in March 1944, with his flag on . As such, he commanded a Task Group of the
Fast Carrier Task Force, which was known as Task Force 58 when part of the
Fifth Fleet and Task Force 38 when part of the
Third Fleet. During the
Gilbert and Marshall Islands campaign he led Task Group 50.3, with the carriers
Essex,
Bunker Hill and . His Task Group attacked
Rabaul on 11 November, and then bombed
Tarawa for three days from 18 to 20 November. For his part in the campaign, he was awarded the
Navy Distinguished Service Medal: For a raid on
Saipan, Montgomery was award the
Navy Cross: For the
Mariana and Palau Islands campaign, Montgomery led Task Group 58.2, with the
Bunker Hill, , and . While his forces won a great victory in the
Battle of the Philippine Sea, Montgomery, in his report on the battle, expressed his opinion that: Montgomery was awarded a second Navy Distinguished Service Medal for his part: A third Navy Distinguished Service Medal was awarded for the Philippines campaign: Montgomery became Commander Fleet Air, West Coast, with his headquarters at the Naval Air Station, San Diego, in January 1945. He tried to bring his experiences in combat to bear in his new role, which involved supplying the combat units with men and equipment. For his services in this job, he was awarded a second
Legion of Merit. In July 1945 he became commander of Pacific Fleet Air Forces, with the rank of
vice admiral. ==Later life==