|Born||26 March 1859
New York City
|Service/branch||United States Navy|
|Years of service||1876 - 1880|
|Awards||Medal of Honor|
Born on 26 March 1859 in New York, New York, Millmore joined the Navy from that state in January 1876.  By October 31, 1877, he was serving as an ordinary seaman on the USS Essex, which was at Monrovia, Liberia. On that day, he and another sailor, First Class Fireman Henry Lakin Simpson, rescued their shipmate Ordinary Seaman John W. Powers from drowning. For this action, both Millmore and Simpson were awarded the Medal of Honor seven years later, on October 18, 1884.
Millmore's official Medal of Honor citation reads:
Serving on board the U.S.S. Essex, Millmore rescued from drowning John W. Powers, ordinary seaman, serving on the same vessel with him, at Monrovia, Liberia, 31 October 1877.
- "Medal of Honor recipients - Interim Awards, 1871–1898". Medal of Honor citations. United States Army Center of Military History. August 5, 2010. Retrieved August 20, 2010.
- Belden, Bauman L. (1915). "United States war medals". American Journal of Numismatics. New York: American Numismatic Society. 49: 68. Retrieved August 20, 2010.