Word: mirved
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There is another view, however. By protecting the ICBM sites, while the Soviets thus far have set up only a primitive ABM defense in the Moscow region, the U.S. may encourage the U.S.S.R. to develop vastly more effective offensive weapons-such as MIRVs, Multiple Independently Targetable Re-entry Vehicles-to overcome the U.S. ABM defense. The Soviets may also feel compelled to deploy a more sophisticated ABM system themselves. The U.S. has already tested MIRVs of its own, although they will not be operational for several years. If the cycle of ABM-MIRV goes on unabated, both nations will...
Further, mutual deterrence would be put in question. Since MIRV would multiply many times the number of warheads either side could deliver against the other, a thin ABM system like Safeguard would not be sufficient to preserve enough of the defender's missiles to allow him to strike back effectively after a massive surprise attack. Thus, the temptation to deliver a pre-emptive strike in an acute crisis like the Cuban missile confrontation would increase. This new step-up in the arms race,* coupled with the Safeguard ABM, would cost the U.S. at least $20 billion and could lead...
...1960s, they developed the first improvement: a multiple warhead known as MRV (for Multiple Re-entry Vehicle). It is a relatively crude device that drops unguided from missiles in clusters of three warheads. Some MRVs have been placed on presently operational Polaris missiles. A further and major refinement is MIRV (Multiple Independently Targetable Re-entry Vehicle), which is similar to MRV but has its own propulsion and guidance systems...
Missiles equipped with the MIRV device have been compared to a space bus that travels above the atmosphere emitting warheads over specific targets. MIRVs could be carried only by the next generation of missiles-the Navy's Poseidon and the Air Force's Minuteman III, which will probably be operational within two years. Both have been successfully tested with MIRVs...
...President's "footprint" statement was yet another disclosure of normally secret intelligence material to bolster the chances for approval of the embattled ABM. For the White House regards its Safeguard anti-ballistic missile system as the answer to the presumed Russian MIRV threat. Among his other warnings, Secretary Laird has said that the Russians are developing an ABM system of their own that can "loiter for a period of time until a specific target is selected...