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A Concise History of the US Air Force - Air Force Historical Studies ...

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meant that warheads could be smaller. New warheads could be sized to<br />

detonate at kiloton or megaton ranges independently. Because <strong>the</strong>y were<br />

smaller and lighter, more warheads could be mounted to each ICBM and<br />

SLBM. In <strong>the</strong> early 1970s <strong>the</strong> DOD developed MIRVs (multiple inde-<br />

pendently targetable reentry vehicles), allowing three or more warheads<br />

on each ICBM and SLBM. The <strong>Air</strong> <strong>Force</strong>’s arsenal did not rise above<br />

1,054 ICBMs; many now carried three MIRVs (Minuteman 111) as<br />

opposed to earlier models that carried a single Minuteman I or I1 war-<br />

head. Strategic launchers remained static, but warheads multiplied.<br />

Although Secretary <strong>of</strong> Defense McNamara introduced “counter-<br />

force” targeting in 1962, <strong>the</strong> improvement in CEP and dramatic increas-<br />

es in <strong>the</strong> number <strong>of</strong> nuclear warheads in <strong>the</strong> American arsenal <strong>of</strong> <strong>the</strong><br />

1970s encouraged <strong>the</strong> <strong>Air</strong> <strong>Force</strong> to return to <strong>the</strong> more traditional practice<br />

<strong>of</strong> bombing precise military targets instead <strong>of</strong> countervalue cities.<br />

Counterforce targeting identified enemy military and industrial choke-<br />

points-command centers, military industries and bases, and ICBM silos.<br />

Whatever <strong>the</strong> targets selected, in <strong>the</strong> 1960s political leaders adopted a<br />

doctrine for deterring nuclear war known as “assured destruction,” i.e.,<br />

<strong>the</strong> capability to destroy an aggressor as a viable society, even after a<br />

well-planned and executed surprise attack on American forces. This doc-<br />

trine held that superpower strategic nuclear forces would be sized and<br />

protected to survive a nuclear attack and <strong>the</strong>n to retaliate with sufficient<br />

force to ensure a level <strong>of</strong> destruction unacceptable to <strong>the</strong> o<strong>the</strong>r side. With<br />

such retaliatory destruction assured against an aggressor, no rational<br />

Soviet or American leader would consider starting a nuclear war. On May<br />

26, 1972, <strong>the</strong> United States and <strong>the</strong> Soviet Union signed <strong>the</strong> Anti-Ballistic<br />

Missile (ABM) Treaty, which limited both sides to two ABM sites each<br />

to protect <strong>the</strong> national capital and an ICBM complex. The treaty rein-<br />

forced <strong>the</strong> continued effectiveness <strong>of</strong> assured destruction in deterring war<br />

in <strong>the</strong> face <strong>of</strong> new, destabilizing ABM weapons. SALT I, <strong>the</strong> Strategic<br />

Arms Limitation Treaty which was signed at <strong>the</strong> same time, limited <strong>the</strong><br />

numbers <strong>of</strong> nuclear weapons with <strong>the</strong> objective <strong>of</strong> obtaining a verified<br />

freeze on <strong>the</strong> numerical growth and destabilizing characteristics <strong>of</strong> each<br />

side’s strategic nuclear forces.<br />

The Nixon administration adopted counterforce targeting begin-<br />

ning with SIOP 5 <strong>of</strong> 1974. The Carter administration expanded it with<br />

Presidential Directive 59 and SIOP 5D. Counterforce, however, <strong>of</strong>fered<br />

an option to assured destruction <strong>of</strong> a limited, prolonged nuclear war based<br />

on accurate attacks with limited collateral damage while maintaining a<br />

creditable second strike capability. In an address on March 23, 1983, Pre-<br />

sident Ronald Reagan proposed replacing <strong>the</strong> doctrine <strong>of</strong> assured destruc-<br />

70

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