Richard Nixon joined the US Naval Reserves in 1942. He started at aviation indoctrination training and upon completion he was sent to the Naval Reserve Aviation Base in Iowa. He then volunteered for sea duty and sent to Guadalcanal and then Green Island. While there he received a Letter of Commendation from Commander of the South Pacific. In 1944, he was assigned to Fleet Air Wing EIGHT, then in 1945 he was assigned to the Bureau of Aeronautics in DC. After this he was sent to NYC by the Bureau of Aeronautics. He was released from active duty in 1946 and was promoted to Commander of the Naval Reserve in 1953 and retired in 1966. Other medals that Nixon earned were: American Campaign Medal (with two engagement stars on it), the Asiatic-Pacific Campaign Medal and the WWII Victory Medal.
You can also see the unit commendations that Nixon signed as President on this site.