"Arizona"s last fleet problem was off Hawaii in April–May 1940. At its conclusion, the United States Pacific Fleet was retained in Hawaiian waters, based at Pearl Harbor, to deter the Japanese. She was overhauled at the Puget Sound Navy Yard, Bremerton, Washington, from October 1940 to January 1941. During this refit, the foundation for a search radar was added atop her foremast, her anti-aircraft directors were upgraded and a platform for four water-cooled caliber M2 Browning machine guns was installed at the very top of the mainmast. Her last flag change-of-command occurred on 23 January 1941, when Willson was relieved by Isaac Kidd, by that time a rear admiral. Captain Harold C. Train assumed command of the ship on 3 February.