During the 1970’s the Air Force Launched a Minuteman Missile from the back of a c-141.
It was actually a C5 Galaxy.
https://www.youtube.com/watch?v=96A0wb1Ov9k
I thought it was the back of a C5A. I know the 141 could transport one, but dropping it out the back in flight for a test? Wouldn’t they have wanted a little more wiggle room for such a test?