The ship served as an aircraft freighter during the war and later as a cargo ship for various companies.[5]
In 1946, after World War II, Dudley H. Thomas was converted to a livestock ship, also called a cowboy ship. From 1945 to 1947, the United Nations Relief and Rehabilitation Administration and the Brethren Service Committee of the Church of the Brethren sent livestock to war-torn countries. These "seagoing cowboys" made about 360 trips on 73 different ships. The Heifers for Relief project was started by the Church of the Brethren in 1942; in 1953, this became Heifer International.[6]Dudley H. Thomas was one of these ships, known as cowboy ships, as she moved livestock across the Atlantic Ocean. Dudley H. Thomas moved 780 horses, several thousand baby chicks and hay bales to Poland, on each leg of her trip. Dudley H. Thomas moved horses, heifers, and mules, as well as some chicks, rabbits, and goats.[7][8][9]
In 1950, a new war was starting in the Far East, so she was removed from the Reserve Fleet in 1951.[5]
Dudley H. Thomas served as merchant marine ship supplying goods for the Korean War. About 75 percent of the personnel taken to Korea for the Korean War came by the merchant marine ship. Dudley H. Thomas transported goods, mail, food and other supplies. About 90 percent of the cargo was moved by merchant marine naval to the war zone. Dudley H. Thomas made trips between 1951 and 1953, helping American forces engaged against Communist aggression in South Korea.[10][11]
On 25 August 1953, she was returned to the National Defense Reserve Fleet, until 5 June 1957, when she was acquired by the US Navy.[5]
One of a class of sixteen radar picket ships, Interpreter conducted shakedown exercises in the Caribbean before departing Guantanamo Bay, Cuba, 1 February 1959, for her new home port, San Francisco, California.[5]
Equipped with the most advanced long range radar and communications gear, Interpreter joined the Continental Air Defense Command (CONAD) as part of America's vital early warning system. Operating with search aircraft for periods of 3 to 4 weeks at sea, the ship reported and tracked aircraft at great distances and controlled interceptors in the event of enemy air attack.[5]
Interpreter continued regular patrols in the Contiguous Radar Barrier, for 6 years, providing a vital link in the air defense of her country.[5]