The list of ship commissionings in 1939 includes a chronological list of shipscommissioned in 1939. In cases where no official commissioning ceremony was held, the date of service entry may be used instead.
^"Aaron Ward I (Destroyer No. 132)". Dictionary of American Naval Fighting Ships. Naval History and Heritage Command. 1 September 2016. Retrieved 13 June 2019. On 30 September 1939, Aaron Ward came out of reserve for the final time. Recommissioned on that day, in response to President Franklin D. Roosevelt's establishment of the Neutrality Patrol following the outbreak of war in Europe at the beginning of the month
^"Abel P. Upshur (Destroyer No. 193)". Dictionary of American Naval Fighting Ships. Naval History and Heritage Command. 23 February 2016. Retrieved 11 September 2019. 4 December 1939, when she was again placed in commission and assigned to the Atlantic Squadron. The ship operated along the east coast on neutrality enforcement patrols