[1] Production numbers are classified, but it is believed that fewer than 150 weapons were produced.
[6] Red Snow was used as both a free-fall bomb and as the warhead of the Blue Steel missile.
[1][7] In the gravity bomb role, it was fitted into the casing of the Yellow Sun weapon, even though the Red Snow warhead was considerably smaller than that of the original Yellow Sun bomb.
Known as Una, this was later reduced in diameter and renamed Ulysses as the physics package intended for the UK warhead on the Skybolt project.
[8] Red Snow used the primary stage Peter, an anglicised version of the US Python device used in the W28.