Following the attack on Pearl Harbor, Wouk joined the U.S Naval Reserve in 1942 and served in the Pacific Theater during World War II, an experience he later characterized as educational: "I learned about machinery, I learned how men behaved under pressure, and I learned about Americans." Wouk served as an officer aboard two destroyer minesweepers (DMS), the USS Zane and USS Southard, becoming executive officer of the latter while holding the rank of lieutenant. He participated in around six invasions and won a number of battle stars. Wouk was in the New Georgia Campaign, the Gilbert and Marshall Islands campaign, the Mariana and Palau Islands campaign, and the Battle of Okinawa. During off-duty hours aboard ship he started writing a novel, Aurora Dawn, which he originally titled Aurora Dawn; or, The True history of Andrew Reale, containing a faithful account of the Great Riot, together with the complete texts of Michael Wilde's oration and Father Stanfield's sermon. Wouk sent a copy of the opening chapters to philosophy professor Irwin Edman, under whom he studied at Columbia, who quoted a few pages verbatim to a New York editor. The result was a publisher's contract sent to Wouk's ship, then off the coast of Okinawa. The novel was published in 1947 and became a Book of the Month Club main selection. Wouk finished his tour of duty in 1946.