Any member of a band dubbed "The President's Own"

MARINE

This elite military branch provides ceremonial music for state functions and is known for its distinctive dress blues uniform.

This clue refers to the United States Marine Band, which has the official nickname "The President's Own" because it’s the oldest active professional musical group in the U.S. and performs at presidential events. The answer is "MARINE" since the band is made up of Marines, and the nickname is a well-known cultural reference. The phrasing hints at the answer by focusing on the band’s members rather than the band itself.