Readiness Condition, or REDCON, level. The mission of a RRF can vary widely, as they are used to respond to any threat the commander chooses to employ them for. A US Army RRF consists of a variable number of trucks, generally a mix of M1151 Up-Armored HMMWVs and, since their introduction, MRAPs. Depending on the mission requirement, additional units can be attached to an organic platoon to expand their capabilities. Examples include attaching Explosive Ordnance Disposal (EOD), teams to a RRF responding to bombs or similar threats and vehicle recovery assets to a RRF expected to recover damaged trucks. Large Scale Ready Reaction Force Large scale Ready Reaction Force used in peacetime such as with the use of US Army's Paratroopers (82nd Airborne Division and the 173rd Airborne Brigade Combat Team), US Army's Airborne Rangers of the 75th Ranger Regiment, United States Marine Corps/USMC's Force Reconnaissance units, US Navy SEALs and United States Army Special Forces and US Air Force's Special Tactics Squadrons, the time frame is sometimes hours to days depending on the geographical location and scale of operation. Because they are usually transported by air, such military units are usually lightly armed, but extremely well trained to compensate for their lower caliber, small arms weaponry and lack of heavy equipment like tanks and other armored vehicles that will soon follow by the larger "heavy" units that are to sustain and hold the ground that the RRF has captured and/or controlled from the spearheaded efforts. See also Quick Reaction Force (QRF) Immediate Response Force Rapid Reaction Force Base defense operations center Force protection Eurofor European Gendarmerie Force European Union Battlegroups Allied Rapid Reaction Corps United States Rapid Deployment Forces Helsinki Headline Goal Force Catalogue - misleadingly sometimes known as the 'European Rapid Reaction Force' References Military units and formations of the United States Force protection tactics