QRF (Quick Reaction Force)

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It is any force that is poised to respond on very short notice, typically less than fifteen minutes.

While the ROK army provides most of the frontline military forces south of the DMZ, as well as more than 1,000 DMZ civil police manning more than 100 guard posts on the 151-mile-long Military Demarcation Line, one US platoon is always in the Joint Security Area [JSA]. Additionally, a US quick-reaction force is always ready to provide reinforcements within minutes of a skirmish with the Korean People's Army. Of the 540 soldiers in the battalion, 60 percent are ROK soldiers and 40 percent are U.S. Army soldiers. The latter serve as security guards or perform administrative, communications and logistics missions.