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The conversions we've seen on screen in "Attack of the Cybermen", "Doomsday" and "Closing Time" strongly suggest the Cybermen only convert others when their numbers are low. The Cybermen in "A Good Man Goes to War" had at least twelve Cyber Legions, so they had plenty of numbers.

Even if the Cybermen were seeking humans to convert, there would be many, many much easier targets than a military base swarming with heavily armed soldiers, Headless Monks, etc.