LOL thanks Renegade......I think
Anyway I sort of explain the use of ground troops in my story as a sort of "WE always have and always will" mentality on the part of the Icarans because afterall sometimes the way you fight wars can become just as much of a "tradition" as your music and other cultural tidbits.
Also given Icaran weapons not being uh "precise" enough you don't really want an SD firing it's guns in "surface support" because you'd likely blow a LOT of stuff up that you didn't want to. (not that their sensors are bad it's just they don't have the mega adjustable phasers of ST)
Yet another good reason they deploy troops is because on a domed colony you can't really take out targets on the ground without killing everyone off.