On transfer to Britain , BYMS - 1 to BYMS - 80 were assigned the British pennant numbers BYMS - 2001 to BYMS - 2080 .
The initial 80 ships were ordered by the U.S. Navy specifically for transfer to the United Kingdom under the Lend - Lease Programme .
On transfer to United Kingdom , BYMS - 1 to BYMS - 80 were assigned the United Kingdom pennant numbers BYMS - 2001 to BYMS - 2080 .
The initial 80 ships were ordered by the U.S. Navy specifically for transfer to the United Kingdom under the Lend - Lease Programme .