Jules James graduated from the U.S. Naval Academy in 1910 and was commissioned an ensign in the U.S. Navy. One of his early assignments was as a White House naval aide to President Woodrow Wilson from 1912 to 1913. The following year James had his first taste of combat, serving on the USS Florida during the Battle of Veracruz. Lieutenant Commander James served as Executive Officer aboard the USS "Rochester" (CA-2) during World War I as the ship escorted convoys to and from Europe. For his actions Jules was give a special letter of commendation. Later, during the 70th U.S. Congress, special dispensation allowed James to accept the French Legion of Honour for his World War I service.