In the spring of 1943, Monadnock operated off the southern New England coast, first for the Minecraft Training Command and then under ComServFor, Atlantic Fleet, before resuming maneuvers in Chesapeake Bay. Reassigned to the Pacific Fleet in late fall, the minelayer departed Norfolk, Virginia, with TG 29.18, transited the Panama Canal and arrived at San Diego 28 December. Routed on to Pearl Harbor, she reported to Commander, Minecraft, Pacific Fleet, 7 January 1944, and by the 13th was underway for the South Pacific.
