... as Strategic Air Forces struggled to cope with better and better ground launched guided missiles; the concept of 'stand-off' weapons emerged. The 'Blue Steel" air launched missile was one such solution developed by the British RAF.
The 'Blue Steel' carried a 'Red Snow' H-bomb. Not to be confused with the 'Yellow Sun' which was the same H-bomb fitted into a gravity bomb casing. I have always thought the British pre-occupation with naming their strategic weapons with some sort of obscure color-code was strange. But they may have felt that American names for weapons like the 'Davey Crockett' or the 'Navajo' were just as eccentric.