The W78 is an American thermonuclear warhead with an estimated yield of 335–350 kilotonnes of TNT (1,400–1,460 TJ), deployed on the LGM-30G Minuteman III intercontinental ballistic missile (ICBM) and housed in the Mark 12A reentry vehicle.

https://wikipedia.org/wiki/W78

I believe that that’s three reentry vehicles (some of which are possibly decoys), and the “base” that they’re on is the missile guidance system.

Here’s a video of a Minuteman III launch. This is an older one, only has a single warhead, but you get the idea.

https://www.youtube.com/watch?v=Mvo54LJcXe8