In 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 SNLEs (''Sous-marin Nucléaire Lanceur d'Engins'') (Device-launching Nuclear Submarine) or
SSBNs from 1971 to 1975. It was replaced by the
M2 MSBS in 1974–75. ==References==