Elite military units used for sudden attacks or shock tactics

A person who takes on difficult or urgent tasks in combat or production; an exemplary worker or soldier who leads a charge or works with high intensity to complete a mission.

a member of a strike force or commando unit; shock trooper

An unexpected, unannounced, or intensive inspection or investigation, or to carry out such an inspection

kamikaze unit; specifically the Japanese corps of suicide pilots used in World War II