They did get it. From EMT training in '87 I remember that Malmstrom was ILCS, Ellsworth was SSAS, Whiteman, Minot & FEW were CDB. Whether any of the CDB's had the G missile, I don't know.
Minot had the G missile starting in 1970, first to get it. When I left in 1972 I heard that CDB buffer was coming soon to Minot.