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In the text below, what does "staff officer" mean?
There he decided to detach another 1,000 men from Wayne's command. Lee was offered command of this advance guard, but he declined. Washington then turned to Marie Joseph Paul Yves Roch Gilbert du Motier, marquis de Lafayette, who was only 20 years old. Lafayette eagerly accepted. Washington's young staff officer, Alexander Hamilton, was dispatched to assist him.