Actually, my first impression is that it would clarify these people (who might not otherwise be widely known) to the mainstream employees as being employees - it is clearly noted that people recognize the help desk members by face, but not by name, and in companies were there is access control is in place, a strangle-familiar face is a security risk.
Don't get me wrong: I think uniforms is a bad idea, making janitors out of skilled talent, when an photo ID badge would probably serve better in a controlled environment.
IT and helpdesk workers don't usually support "walk-by" requests because it circumvents documentation and is very unproductive as a rule.
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