A few suggestions for the security guards:
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They should have melee defense abilities (at least against zombies and headcrabs).
It would be weird , if a special trained security force wouldn’t be able to defend themself at close range. -
It would be nice, if the radios you added to their protective vest would be used in one or two situations as a scripted sequence.
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It would also be nice to see security guards without their helmet and dirty faces in the later course of the game.
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Gun lockers and gun racks would be nice furniture details for security stations and also a way for the player to come by weapons.
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I know, that guards will be able to take better weapons like a shotgun or mp5 (like the rebels from HL2). But in my opinion a few guards in the later course of the game should already have a better weapon. It would make sense at least.