The son of millionaire Andrew B. Hammond of San Francisco, California, socialite Leonard Coombes Hammond attended Harvard in 1901 and 1902. From November 1915 until November 1916 he was a driver in the Norton-Harjes Ambulance Corps on the Western Front. Upon his return to San Francisco, he entered officer's training at the Presidio in May 1917 and was commissioned 1st Lieutenant on 15 August 1917. Hammond was assigned to the 1st Observation Group on 1 October 1917 and embarked for France on 17 December 1917. He joined the 91st Aero Squadron on 14 June 1918 and scored 6 victories flying the Salmson 2A2 as an observer. Hammond returned to the United States on 14 January 1919 and was discharged from the army 18 February 1919.
The Oregonian, Portland, Oregon, Saturday, 22 December 1945, page 7
California, San Francisco Area Funeral Home Records, 1895-1985
Distinguished Service Cross (DSC)
The Distinguished Service Cross is presented to Leonard Coombes Hammond, First Lieutenant (Air Service), U.S. Army, for extraordinary heroism in action in the region of Metz, France, September 15, 1918. While on a photographic mission Lieutenant Hammond's formation was attacked by a superior number of enemy pursuit planes. Notwithstanding that the enemy planes succeeded in driving off the protecting planes, Lieutenant Hammond and his pilot, Lieutenant Dickens, continued on alone. Continually harassed by enemy aircraft, they completed their photographs, and on the return fought their way through an enemy patrol and destroyed on of the machines.