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The US Minuteman 3 is the only US land-based MIRV ICBM currently in use. These MIRV capable ICBM’s are especially used because they are harder to counter with anti ballistic missile systems due to number of independent re-entry vehicles in the re-entry phase. True to keeping the world more on edge, the Russians are developing the Bulava(SS-27 class) sea-launched MIRV ICBM. Supposedly the most advanced MIRV ICBM to date and still under development. This is obviously in response to the US Ballistic missile “Shield” that is under development.