To Creator-
Friend, you really need to learn more about "The Universial Union" (Combine) That few rebels could never managed to get into the Citadel, also no rebel managed inside expect Alyx and Gordon.
Scanners and Metro-Police Units are not supposed to be inside the Citadel, they patrol and guard outside in the city, but most-likely you are on the Great War. The Union is an orginized kind, they did not have equipment around, and when The "Resistance" attacked, then they sent the Overwatch squad or Elite Squad.
Johnny.
johnnyXfire
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