[Suicide Junkie]

Hmm.
How about the missile bases and the ground bases...

What about making the ground base into a cargo facility?
That way, you'd be able to add more troops and get something with the same general idea.

The missile bases would have to be weapon platforms, that take up a decent sized portion of the cargo space provided by the ground-base.

So, it would be a ground base, that can be used to either increase the troops on the planet, or hold missile launchers. Sort of a half-way thing.
The ground base cargo amount would have to be scaled to an average sized planet.