Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Q: 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.
Answer : United States Marine Corps
A:
Which armed forces did Welton Ralph Abell serve?