Walt enlisted in the
Colorado National Guard at the age of 17. Upon graduation, he was
commissioned a
second lieutenant in the
Army Field Artillery Reserve, but resigned that commission to accept an appointment as a Marine second lieutenant on July 6, 1936. Lieutenant Walt completed
The Basic School at Philadelphia, and in April 1937 was assigned to the
6th Marine Regiment in
San Diego, California, as a
machine gun platoon leader. Embarking for China in August 1937, he took part in the defense of the
International Settlement of
Shanghai until February 1938, at which time he returned to San Diego. In June 1939, he began his second tour of overseas duty when he was assigned to the Marine Barracks,
Guam,
Mariana Islands. He was promoted to first lieutenant in October 1939.
World War II Early in 1942, Walt volunteered to join the
1st Marine Raider Battalion, and in April 1942 arrived with the battalion on
Samoa. On August 7, 1942, as commander of Company A, 1st Raider Battalion, he landed his company in the assault on
Tulagi Island in the
British Solomon Islands. He was awarded the
Silver Star Medal for conspicuous gallantry during this landing. Following this action, he joined the
5th Marines on
Guadalcanal, where he took part in combat as
commanding officer of the
2nd Battalion, 5th Marines. He was promoted to major in September 1942. For these actions, Lieutenant Colonel Walt was awarded his second Navy Cross for gallantry in action. In November 1944, Walt returned to the United States, and the following month assumed duty at Marine Corps Schools, Quantico, as Chief of the Marine Officer Candidates' School Tactics Section.
Post-World War II Assigned to
Camp Pendleton in January 1947, he served as assistant chief of staff, G-3, 3rd Marine Brigade, and then as G-3, 1st Marine Division. In November 1947, he assumed duty as operations and training officer, 1st Provisional Marine Brigade on
Guam, and later served as Chief of Staff of that organization from February to April 1949. Returning to Marine Corps Schools, Quantico, in May 1949, he saw duty as a battalion commander with the Special Training Regiment; and in September, he entered the Amphibious Warfare School, Senior Course. On completing the course in June 1950, he remained at Marine Corps Schools to serve as chief of Tactics Section, S-3, and finally, executive officer, The Basic School. He was promoted to colonel in November 1951.
Korean War Colonel Walt was ordered to
South Korea in November 1952, where he was in combat with the 1st Marine Division until August 1953, serving consecutively as commanding officer, 5th Marines, assistant chief of staff, G-3, and chief of staff of the division. He received both the
Legion of Merit with
Combat "V" for Valor and the
Bronze Star Medal with Combat "V" for Valor, for exceptionally meritorious service during this assignment. The Republic of Korea government also awarded Walt the Ulchi Medal and the Ulchi Medal with Silver Star for this period of service.
Post-Korea On arrival at Marine Corps Schools, Quantico, in August 1953, he saw duty as director, Advanced Base Problem Section, Marine Corps Educational Center, through May 1954, followed by duty as commanding officer, Officers' Basic School, until August 1956. He also served as a Member of the Advanced Research Group, Marine Corps Educational Center, until June 1957. Transferred to Washington, D.C., Walt served as assistant director of personnel until August 1959, then entered the
National War College, Washington, D.C.. He completed the course in June 1960. In July 1960, he began a one-year assignment as Marine Corps representative on the Joint Advanced Study Group of the
Joint Chiefs of Staff. Upon completing this assignment, he was promoted to brigadier general and reported for duty at
Camp Lejeune as assistant division commander,
2nd Marine Division. In September 1962, Walt returned to Marine Corps Schools, Quantico, serving as director of the Marine Corps Landing Force Development Center there until May 1965.
Vietnam War In May 1965, Walt was promoted to major general, and in June 1965 assumed command of
III Marine Amphibious Force and
3rd Marine Division in
South Vietnam. He was also chief of naval forces, Vietnam and senior advisor,
I Corps and I Corps coordinator, Republic of Vietnam. Ten months later, President
Lyndon B. Johnson nominated Walt for lieutenant general. The
Senate confirmed his promotion on March 7, 1966. He continued in Vietnam as commanding general, III Marine Amphibious Force, and senior advisor, I Corps and I Corps Coordinator, Republic of Vietnam. During this period, the Secretary of the Navy awarded Walt his first
Distinguished Service Medal. In addition, the Vietnamese government awarded him the Vietnamese National Order, 3rd Class; the Vietnamese National Order, 4th Class; the Gallantry Cross with Palm; the Chuong My Medal, and the Vietnamese Armed Forces Meritorious Unit Citation of Gallantry Cross with Palm. The Government of South Korea also awarded Walt the senior
Ulchi Medal. As a testament to his vital role in Vietnam,
Life magazine featured Walt in a May 1967 cover story. The article noted the success of an innovative program initiated by Walt in August 1965 called the
Combined Action Program (CAP). This program consisted of squads of Marine and Navy
medical corpsmen volunteers for combined action platoons (CAP), that were part of
combined action companies (CAC), combined with
South Vietnamese Popular Force platoons, which were sent into South Vietnamese countryside villages and hamlets to deny the
Viet Cong access to the people living there. As
Life noted, "His CAC units all had the same orders: help protect the villages, get to know the people, find the local Communist infrastructure and put it out of business." Walt stressed the importance of using combined action companies to win the confidence of average, ordinary Vietnamese citizens. The magazine observed, "If these people could be located and won over, Walt argued, the Communists would be hit where it hurts." Because of the Combined Action Program, the number of "secure" villages under Walt's protection rose between 1965 and 1967 from 87 to 197, while the number of Vietnamese living in "secure" areas in general rose from 413,000 to 1.1 million.{{cite news
Assistant commandant Upon his return to the United States, he saw duty from June 1967 until the following December as deputy chief of staff (manpower)/director of personnel, at
Headquarters Marine Corps. On January 1, 1968, he was designated Assistant Commandant of the Marine Corps. In April 1969, the Senate passed and sent to the
White House a bill to make the assistant commandant of the Marine Corps a
four-star general when the active duty strength of the Marine Corps exceeded 200,000. On May 5, President Richard M. Nixon signed the bill, and Walt was promoted to four-star rank on June 2, 1969, thus becoming the first
assistant commandant of the Marine Corps to attain that rank. While visiting the Taiwan Defense Command in April 1970, Walt was presented the
Order of the Cloud and Banner with Grand Cordon, by General
Kao Kuei-yuan of the Republic of China. Presented by the chief of the General Staff, the citation recognized the Assistant Commandant's "exceptionally meritorious conduct in the performance of outstanding service to the Chinese Marine Corps." The citation noted that Walt had "contributed immensely in the furtherance of military cooperation and traditional friendship between the United States of America and the Republic of China." ==Retirement==