He retired as Rear Admiral on 28 November 1918, and was advanced to Vice Admiral on the retired list on 21 June 1930. He died at Jamestown, Rhode Island, on 27 June 1932.
Namesakes
U.S. Navy Lieutenant Commander A. S. Snow named Coffman Cove in Alaska after Coffman in 1886.[3]
Coffman is standing fifth from the left in this 7 August 1928 photograph of retired U.S. Navy rear admirals and other retirees at Rear Admiral Spencer S. Wood's home in Jamestown, Rhode Island.