Not until Eisenhower, where he gave pre-delegated launch authority to the Military in case ofnSneak Attack.That, and the US military really doesn't, or didn't, have the freedom of action to launch pre-emptive attacks of such a scale. If such a thing were being planned, the Soviets would have caught wind of it from the very beginning.
Had LeMay been as much a psycho as his successor, General Powers, he could have set WWIII in motion without even the Navy knowing about it, let alone anyone in Russia.
USSR had a lot of spies. They didn't have a realtime way to know what SAC was doing at any given minute. They had no spysats, no BMEWS, little radar coverage over the Pole.
The Soviets had real difficulties, late into the '60s to have warned their entire Military that SAC had gone past their FailSafe points in bombers, let alone what Atlas, Titan, Thor and Jupiter, were up to, along with what Navy was doing with Polaris, till Mushroom Clouds sprout.