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- 34d2db09f2f21327968dd9c82444873c8c2f816ebc188694374f96616e58d844 date "March 2014".
- 34d2db09f2f21327968dd9c82444873c8c2f816ebc188694374f96616e58d844 isCitedBy Ballistic_Missile_Early_Warning_System.
- 34d2db09f2f21327968dd9c82444873c8c2f816ebc188694374f96616e58d844 text "The Soviet Union developed a Fractional Orbital Bombardment System in part to counteract the network of sensors covering the northern hemisphere, including BMEWS, which was only able to point in a fixed direction. FOBS placed a warhead in low earth orbit, reducing the line-of-sight ranges tremendously compared to the traditional lofted trajectories of a conventional ICBM. Additionally, the FOBS could be launched southward, overflying most of the globe and then approaching the U.S. from the south, where it would be invisible to BMEWS. Submarine-launched ballistic missiles also avoided detection by BMEWS, developing into a credible threat in the 1970s. The Defense Support Program early warning satellites were developed in part to counter this threat, detecting the infrared "bloom" from the launch rockets no matter where they occurred.".