fire brigade

noun3

1. •
   (US) A group of people within a corporation or industrial site, organized for the purpose of extinguishing fires, usually in addition to their normal job.
2. •
   (UK, Ireland) An organization, often part of a local government, whose purpose is preventing and putting out fires.
3. •
   (US) A trained unit that can be rapidly deployed to deal with any difficult situation.

   • General Westmoreland used some incoming troops as a fire brigade to squelch major threats and keep the Communists off balance. — 1976