noun
Refers to the maritime security organization responsible for coastal patrol, search and rescue, and law enforcement at sea.
沿岸警備隊が密輸船を拿捕した。
The coast guard seized a smuggling vessel.
海上保安庁 is the Japan Coast Guard, the specific Japanese organization. 沿岸警備隊 is a more generic term for any coast guard.
Compound of 沿岸 (coast) + 警備 (guard, security) + 隊 (corps, unit).