In May 1942, Galer assumed command of Marine Fighting Squadron 224 (VMF-224) and on August 30, 1942 led the squadron to Guadalcanal as they became part of the Cactus Air Force. It was while in command of VMF-224 that Galer would be credited with 11 confirmed victories and be awarded the Medal of Honor and a rare British Distinguished Flying Cross for the same acts of heroism.
Following the presentation of the Medal of Honor by President Franklin D. Roosevelt at the White House on March 24, 1943, Maj. Galer was ordered to Marine Corps Air Station Miramar, where he served as Assistant Operations Officer. Shortly after advancement to the rank of Lieutenant Colonel in November 1943, he was ordered to return to the Hawaiian Islands, where he became Chief of Staff, Marine Air, Hawaiian Area.
In May 1944, LtCol. Galer was named as Operations Officer, 3rd Marine Aircraft Wing. He served as an observer during the Palau Islands and Iwo Jima campaigns while on temporary duty from the 3rd Marine Aircraft Wing. His next assignment found him as Training Officer of Provisional Air Support Command, Fleet Marine Force, Pacific.
He again returned to the United States in June 1945 and reported to the Marine Barracks, Naval Air Training Base, Corpus Christi, Texas, in July as officer in charge of a cadet regiment. He remained in that capacity until August 1947, at which time he was assigned as a student at the Armed Forces Staff College in Norfolk, Virginia.
In June 1948, he reported to the 2nd Marine Aircraft Wing, at the Marine Corps Air Station Cherry Point, North Carolina, where he served as Operations and Training Officer. He joined Headquarters Squadron-2 at that station in April 1949 and was transferred April 26, 1950 to the Naval Air Station San Diego, California. He served there as Marine Planning Officer and, later, as Assistant Chief of Staff for Plans, on the Staff of the Commander, Air Force, U.S. Pacific Fleet. During his assignment, he was promoted to colonel in March 1951.
Colonel Galer was also awarded the Legion of Merit with Combat "V" for his service in Korea. On August, 5, 1952, he was shot down behind enemy lines by anti-aircraft fire while leading a flight of 31 warplanes against targets near the North Korean port city of Wonsan. He was later rescued by a HO3S-1 helicopter flown by 1stLt E.J. McCutcheon..
After a period of hospitalization, he returned to duty at Marine Corps Air Station El Toro, California, in October 1952, as Assistant Chief of Staff, G-1 (Personnel), and later, G-3 (Operations), of Aircraft, Fleet Marine Force, Pacific. He was enrolled as a student in the Air War College, Maxwell Air Force Base, Montgomery, Alabama, in July 1953. Upon graduation from the College the following June, he was transferred to Headquarters Marine Corps, Washington, D.C., where he became Assistant Director, Guided Missiles Division, Bureau of Aeronautics, Department of the Navy. He served in that capacity until January 1956, when he became Acting Director. The following June he was awarded a Masters Degree in Engineering Administration from the George Washington University, Washington, D.C.
For exceptionally meritorious service in combat, he was advanced to brigadier general upon his retirement on July 31, 1957.
Brigadier General Galer died on June 27, 2005 in Dallas, Texas.