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SS RO-56
Imperial Japanese Navy submarine
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| Class | Laid down, Shipyard | Launched | Commissioned | Disabled and Why | |
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| Kaicu 6 | | 1944/11/15 | 1945/03/18
missed | ||
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WW II combat actions:
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| From | Till | Operation | Force | Action | Source |
|---|---|---|---|---|---|
| 45/03/20 |   |   |   | sail to Okinawa |   |
| 45/04/09 |   |   |   | sunk(Monssen II,Mertz) 130 nm E of Nakagusuku Wan, Okinawa (26-09N, 130-21E) |   81  85  |