Cuban Missile Crisis established a naval blockade on October 22 to prevent further missiles from reaching Cuba; Oval Office tapes during the crisis revealed that Kennedy had also put the blockade in place as an attempt to provoke Soviet-backed forces in Berlin as well. The US announced it would not permit offensive weapons to be delivered to Cuba and demanded that the weapons already in Cuba be dismantled and returned to the Soviet Union. After several days of tense negotiations, an agreement was reached between US President John F. Kennedy and Khrushchev. Publicly, the Soviets would dismantle their offensive weapons in Cuba and
550th Strategic Missile Squadron 550th SMA along with the 551st Strategic Missile Squadron at Lincoln AFB, Nebraska, on 1 April 1961, marked the first standing up of Atlas F units. The squadron was assigned twelve missiles, based in a 1 x 12 configuration: twelve independent widely dispersed launch sites comprised the missile squadron. In June 1962, the first operational sites for the Atlas F ICBMs were accepted by SAC and in September the squadron was declared operational. In the following month during the Cuban Missile Crisis, the 550th received orders to maintain all 12 missiles on alert status. The Atlas F was the final