It is necessary for technical reasons that these warheads be stored upside down; that is, with the top at the bottom and the bottom at the top. In order that there may be no doubt as to which is the bottom and which is the top, it will be seen to that the bottom of each warhead immediately be labelled with the word TOP.

– British Admiralty, quoted in Applied Optics, January 1968

(Guys and Dolls – Futility Closet)

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