MR 41
The MR 41 is a French-built nuclear warhead to be launched with the M1 and M2 missiles in Redoutable-class [submarine (1967)|Redoutable class] ballistic missile submarines.
It had a yield of 500 kilotons and was boosted fission warhead based on highly [enriched uranium] combined with deuterium and tritium.
Entering service in 1972 it was withdrawn from service by the end of 1979, being replaced by TN 60 thermonuclear warheads.