Tête nucléaire océanique (TNO or oceanic nuclear warhead) is a French thermonuclear warhead intended for use on the M 51 submarine-launched ballistic missile, that is being developed and built by the Division of Military Applications (DAM) at France's Commissariat à l'énergie atomique et aux énergies alternatives (English: Atomic Energy and Alternative Energies Commission). It will be carried on Triomphant-class submarines. The TNO is intended to replace the currently deployed TN 75 warhead. Its commissioning is planned for 2015, when France's newest submarines, either Le Terrible or Le Vigilant, will be one of the first to carry the warhead.