The PBO - 1s were twenty Hudson Mk. IIIA aircraft diverted from Lend - Lease to equip VP - 82 .
The PBO - 1s sank the first two U-boats by US forces ; U-656 on 1 March 1942 and U-503 .
The PBO - 1s were twenty Hudson Mk. IIIA aircraft diverted from Lend - Lease to equip VP - 82 , and sank the first two U-boats by US forces ; U-656 on 1 March 1942 and U-503 .