It will take some time to completely level it up but it's worth it. It's a last ditch support system for when things get too heavy. It spawns snipers, boomshots, or hammer strikes depending on the level your on.
Clarify please.....I upgraded the turrets fully. Now a Command Center TV icon pops up along with the decoy, fences, etc icons during the 20 sec rebuild between levels. But where do you actually get "into" the command center to do so-called damage :)