USS Alleyne (NCC-557)

The USS Alleyne (NCC-557) was an uncommissioned destroyer starship of the Jenghiz-class proposed to be built by the Federation Starfleet.

The project was cancelled and construction the vessel never completed. (Jackill's)
 * ''Its possible that whatever materials already invested in contract #557 went on to become another starship of a different class bearing that, or another number.