Working on behalf of the French Defence Procurement Agency (DGA or Direction Générale de l´Armement) since the 1960's, Astrium has produced the submarine-launched MSBS family - M1, M2, M20, M4 - of the French deterrent force. The latest version, the M-45, is currently deployed on board France's new generation submarines. The MSBS-M51, an ultra-modern missile with considerably enhanced performance has been under development since 1992. Designed to replace the M45 SLBM, the MSBS-M51 was first deployed in 2010.
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