M1 (missile)The M1 MSBS was the first French submarine-launched [ballistic missile].OverviewIn French, MSBS is the abbreviation for Mer-Sol Balistique Stratégique, or Sea-Ground Strategic Ballistic Missile. It has two stages. It was deployed on the Redoutable-class [submarine (1967)|Redoutable-class] SNLEs or SSBNs from 1971 to 1975. It was replaced by the M2 MSBS in 1974–75.