Ca. 1942-1945. "Unofficial" cap badge worn on a "barracks cap" by individuals in the War Shipping Field Service. The Field Service was comprised of inspectors who visited shipyards and manufacturing sites where ships were being built under contract…
Ca. 1943-1945. The hat badge belonged to an employee of the WSA that worked aboard a WSA-owned and operated vessel as a ship pilot.An analysis is here:
http://ianewatts.org/war-shipping-administration