Cuban Missile Crisis
The US raised the readiness level against Russia
U.S
At 10:00 pm EDT, the US raised the readiness level of SAC forces to DEFCON 2. For the only confirmed time in US history, B-52 bombers went on continuous airborne alert, and B-47 medium bombers were dispersed to various military and civilian airfields and made ready to take off, fully equipped, on 15 minutes' notice.