The word "brass" became synonymous to "officers", "senior officers" or "command" due to their brass rank badges. I'm curious when was the first recorded usage of "brass" in this meaning.
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The OED has a example from 1870:
1870 Beloit College Monthly Oct. 12 At every big plantation or negro shanty yard Just to save his property the generals plase a gard The sentrys instruction to let no private pass, The rich mans house and table are fixed to suit the brass.