BatDiv3 had been part of the Pacific Fleet until 20 May 1941 when its three ships were transferred to the Atlantc Fleet for Neutrality Patrol duty.
On 19 September 1939, he reported to the destroyer USS Greer (DD-145) at the Philadelphia Navy Yard at Philadelphia, Pennsylvania, where Greer was undergoing preparations for recommissioning on 4 October 1939 to become a part of the Neutrality Patrol ordered soon after World War II began in Europe.
In command of Destroyer Division 21 from September 1937 into 1939, Moore organized the New England section of the Neutrality Patrol in late 1939.
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