 Vanderbilt renamed her PIONEER after 1937 and before visiting Isla Floreana (Galapagos) in her on 4 Jun 41.On 17 Aug 42 the Navy assigned her the name EL CANO "after the former vessel of that name" (presumably ELCANO, PG-38), and she operated during the rest of the war "in service" in the 11th Naval District.A report that the Coast Guard used EL CANO ex PIONEER for merchant training between 1939 and her return to the MC on 31 Aug 42 appears to be inconsistent with the preceding information, but merchant training could have been her function in the 11th Naval District.