... what appears to be a MITO (Minimum Take-Off) drill of US Air Force B-52's. Getting all of your bomber 'assets' off the ground in the fastest time is very important in nuclear warfare. What's on the ground is a target. A missile launched from a sub near the US Coast can travel a 'suppressed' flattened trajectory and hit an airfield in the middle of the country faster than you can say "Colonel's Extra Crispy"!
Most 'war-plans' anticipated a prelim. of rising international political crisis. During those few days the bomber force would be 'dispersed' to many airports including municipal airstrips. So if you see B-52's being parked at your local airport it's time to get very worried!