Teacher:Generate a correct and concise answer for the question based on the words in the context.
Teacher: Now, understand the problem? Solve this instance: Context : Colonel Welton Ralph Abell (May 17, 1922 -- April 26, 1998) was a United States Marine Corps officer serving in the Korean War, as well as a former advertising executive.
Question : Which armed forces did Welton Ralph Abell serve?
Student:
United States Marine Corps