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Douglas Harper's Etymology Dictionary
task-force

1941, originally military; see task (n.) + force (n.).

Wiktionary
task-force

n. 1 a temporary group of military units brought together, under a single commander, to accomplish a specific objective 2 (context by extension English) a similar group of individuals assigned a task

Usage examples of "task-force".

Strength and organizational data on the Peacekeepers, including base and task-force locations?