Y - Yellow Sun ([UK] Nuclear bomb, a free-fall weapon. The codename refers to the bomb casing, the actual nuclear weapon in it was changed at least once. The Mk.1 version used the 'Green Grass' H-bomb package.)
F - Fid: A fid is an elongated conical tool used for splicing ropes. It is more commonly used to describe a sailor who displays lesser personal qualities.
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