noun
military band; naval band
Refers to a musical ensemble belonging to the army or navy, performing at ceremonies, parades, and official events.
軍楽隊がパレードで行進曲を演奏した。
The military band played a march at the parade.
吹奏楽団 is a general wind band, not necessarily military, while 軍楽隊 specifically belongs to the armed forces.
Compound of 軍 (military) + 楽 (music) + 隊 (group, corps). The term is a straightforward Sino-Japanese formation.