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Freebase(0.00 / 0 votes)Rate this definition: Billet. A billet is a term for living quarters to which a soldier is assigned to sleep. Historically, it referred to a private dwelling that was required to accept the soldier.
One is a command billet and the other is an MOS support billet. A command billet will take precedence if all other factors are equal (time in grade, time in service). Most Gunnery Sergeant promotees are evaluated against their career track and asked what they would like to be.