After air, water and food, the thing humans need most is shelter.
The same is true for Cub Scouts, Scouts BSA members and Venturers. You must feed them and water them, but you must also give them a place where they can grow. Somewhere to learn, to laugh, to play, to plan — and to store all their Scouting stuff.
These three units do more than offer a meeting place. They cultivate a Scouting home.