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Well, "cover fire" is a noun, and can't be used as a command.

It's called that because it's how you cover people.

If you ask someone to darn your sock, and they do, will you complain "hey, I didn't say 'darning needle'"?



A marine saying “cover fire” is asking you to shoot.

A cop saying “cover me” is asking for something the marine might call overwatch.




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