Rescue & Target Towing Launch
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| D-Boats 1955 - 1961 |
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| Mk.1 1949 - 1960 |
Mk.1A 1953 - 1977 |
Mk.1B 1956 - 1962 |
Mk.2 1957 - 1978 |
Mk.2(EHC) 1959 - 1971 |
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| Mk.3 Prototype 1972 - 1991 |
Mk.3 1976 - 1991 |