What security do Proxy Servers offer

I have been advised to route Internet access via a Proxy Server for "security", but I cannot work out what security it offers. At the moment, all PCs are hidden behind a firewall with NAT.

The only thing I can see it offering with security is a mechanism to monitor my users Internet access.

Am I missing anything?
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MortimerCatAsked:
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jakosysadminCommented:
mandatory web proxies give the benefit of web usage monitoring which might be desirable for the company owners and falls securely under security.
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jakosysadminCommented:
filtering is even better example of applying security through proxy use. One can implement intricate combinations of filtering rules in a proxy.
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MortimerCatAuthor Commented:
You seem to be confirming what I thought.

Web proxies are there to provide protection from my own users!  If I can trust my users, then a proxy server would provide no more security benefit?

I appreciate "trust my users" is a bit vague, and proxies provide other advantages such as caching.  
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Dave HoweSoftware and Hardware EngineerCommented:
don't think of active filtering as being protection from  your users - think of it as protecting them from web-borne issues by gaining the opportunity to virus scan and perform IDP/IDS at the perimeter.

really advanced solutions can even proxy (and virus scan) https traffic!
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