Question: How many years of service must be performed to receive the ribbon created by the first United States Secretary of Defense?

Related documents: [0]  [DOC] The Marine Corps Reserve Ribbon was a service ribbon of the United States Marine Corps which was issued between the dates of the December 17, 1945, and December 17, 1965. The ribbon was first created by Secretary of the Navy James Forrestal and recognizes those members of the Marine Corps Reserve who performed ten years of honorable reserve service. [END] 
[1]  [DOC] James Vincent Forrestal (February 15, 1892 – May 22, 1949) was the last Cabinet-level United States Secretary of the Navy and the first United States Secretary of Defense. [END]  
Answer: ten years
ten years