[1] Webster was then attached to the 2nd Battalion, 5th Marines under the command of lieutenant colonel William J. Whaling and served as Assistant Mortar Platoon Leader at Camp Lejeune, New River, North Carolina until January 1942.

Following the declaration of War on Japan, he was ordered to Panama Canal Zone and served with the Marine Barracks there under Colonel James F. Moriarty until January 1943.

He then returned to Camp Lejeune, North Carolina and following the promotion to the rank of captain, Webster assumed duty as commander of Weapons Company, 1st Separate Battalion.

[1] Webster was appointed commanding officer of Company D in October 1943 and participated in the amphibious exercises along the Santa Margarita River, where regiment practiced night attacks and pillbox assaults.

[1][2] Webster then relieved Major Robert N. Fricke as executive officer of 1st Battalion, 24th Marines and remained in that capacity during the period of training and reequipment at Maui, Hawaii.

Following the graduation from the course in summer 1947, Webster was ordered to Naval Air Station Quonset Point, Rhode Island, where he served as the commanding officer of the Marine Barracks until June 1950.

Webster then attended Senior School at Quantico and assumed duty as assistant intelligence officer of 2nd Marine Division under Major General Reginald H. Ridgely.

He was responsible for the amphibious training of all units of Fleet Marine Force, Pacific including that ones going to Vietnam and received the Legion of Merit for his service in this capacity.

He led his command during Operation Houston in Thừa Thiên Province against North Vietnamese and Vietcong units and later in Vĩnh Lộc District.

His second tour in Vietnam ended in June 1969 and Webster received the Legion of Merit with Combat "V" for "exceptional initiative and ability while rendering invaluable assistant in the enormous task of directing Marine Corps support activities in the Western Pacific area".