Ex-US Bluebird class mine sweeper acquired by Military Assistance Program.
| Standard Displacement | 335t | 
| Length | 43.50m | 
| Beam | 8.28m | 
| Draught | 2.50m | 
| Machine Type | 2 GE8-268A Diesel | 
| Output | 880PS | 
| Number of shaft | 2 | 
| Speed | 14kt | 
| Crew | 39 | 
| Original | Radar Refit (1960) | |
| Guns | 1 Mk 24 20mm MG(II) | as left | 
| AS Weapons | 1 Mine sweeping set | as left | 
| Electronic Equipment | 1 SO SS Radar 1 UQS-1 | 1 OPS-4 SS Radar 1 UQS-1 | 
| Name | Laid Down | Launched | Completed | Transfered | Deleted | 
| MSC 651 Yashima | ? | ? | 1954/12/01 | 1954/12/16 (ex-AMS 144) | 1970/03/02 (YAS 46) 1978/03/20 | 
| MSC 652 Hashima | ? | ? | 1954/05/07 | 1955/06/03 (ex-AMS 95) | 1970/03/02 (YAS 47) 1976/03/31 | 
| MSC 653 Tsushima | ? | ? | 1956/07/01 | 1956/07/18 (ex-MSC 255) | 1973/03/31 (YAS 60) 1978/03/20 | 
| MSC 654 Toshima | ? | ? | 1957/01/28 | 1957/02/01 (ex-MSC 258) | 1973/07/02 (YAS 61) 1978/03/20 |