The RT-2 is a road mobile 3-stage, single warhead ICBM. Its 21.5 meter length and 1.7 meter diameter are approximately the same size and shape as the U.S. Minuteman ICBM. It has a throw-weight of 1000 kg and carries a single warhead with a yield of 800 kt and accuracy (CEP) of 200m. Its road mobile capability gave the RT-2PM Topol an extremely high probability of survival. It can fire from field deployment sites or through sliding roof garage bases. The RT-2PM Topol joined operational Soviet SRF regiments in 1985. A total area of approximately 190,000 square kilometers could be required to deploy a force consisting of 500 road-mobile Topol ICBMs. Mobile units require a much higher number of personnel for maintenance and operation than fixed systems. Consequently, the RT-2PM Topol was significantly more costly to maintain and operate than silo launched systems.