noun
paratroop corps; airborne unit
Military term for a unit of soldiers trained to parachute into operations.
降下部隊が敵陣の背後に降下した。
The paratroop corps dropped behind enemy lines.
Synonymous; 落下傘部隊 explicitly includes 'parachute' (落下傘), while 降下部隊 focuses on the descent (降下) aspect.
Compound of 降下 (こうか, 'descent, drop') and 部隊 (ぶたい, 'unit, corps').