A rapid reaction force / rapid response force (RRF), quick reaction force / quick response force (QRF), immediate reaction force (IRF), rapid deployment force (RDF), or quick maneuver force (QMF) is a military or police unit capable of responding to emergencies in a very short time frame.
Saitama Prefectural Police Riot And Tactics Squad (RATS) officers on the side of a police helicopter. Riot Police Units such as RATS are the rapid reaction forces of Japanese prefectural police.
A United States Army quick reaction force staging area at Camp Buehring, Kuwait in 2005
82nd Airborne Division paratroopers boarding a transport aircraft
In the law enforcement system in Japan, prefectural police are prefecture-level law enforcement agencies responsible for policing, law enforcement, and public security within their respective prefectures of Japan. Although prefectural police are, in principle, regarded as municipal police, they are mostly under the central oversight and control of the National Police Agency.
Osaka City Municipal Police cars, c. 1948–1955. This photograph predates the prefectural police system.
Tokyo Metropolitan Police Department headquarters building in Kasumigaseki, Chiyoda
The Akita Prefectural Police Headquarters in Akita City
A police officer talking to children in front of a kōban