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In 1964, the United States began full-scale military operations in [[Vietnam]]. B-52's from SAC participated in this by dropping large quantities of conventional bombs on enemy strongholds in the [[jungle]], a procedure called [[carpet bombing]].<ref name=GlobalSec/>

In 1964, the United States began full-scale military operations in [[Vietnam]]. B-52's from SAC participated in this by dropping large quantities of conventional bombs on enemy strongholds in the [[jungle]], a procedure called [[carpet bombing]].<ref name=GlobalSec/>

Toward the end of the 1960s, SAC began retiring many of its older bombers. One interesting replacement was the [[FB-111]], a medium-range bomber that could also dogfight. It replaced the [[B-58 Hustler]] introduced in the 1950s.

Toward the end of the 1960s, SAC began retiring many of its older bombers. One interesting replacement was the [[FB-111 Aardvark]], a medium-range bomber that could also dogfight. It replaced the [[B-58 Hustler]] introduced in the 1950s.

In the late 1960s came the first experiments in [[anti-ballistic missile]] technology. But deployment of these "anti-missiles" became politically infeasible, and in 1972, President [[Richard Nixon]] negotiated a [[treaty]] with the Soviets that neither side would deploy anti-missiles against the other's incoming missiles. The prospect of mutual assured destruction would remain.

In the late 1960s came the first experiments in [[anti-ballistic missile]] technology. But deployment of these "anti-missiles" became politically infeasible, and in 1972, President [[Richard Nixon]] negotiated a [[treaty]] with the Soviets that neither side would deploy anti-missiles against the other's incoming missiles. The prospect of mutual assured destruction would remain.