Had to look up what the hell Derka ment.  I'm assuming you're saying that the Army has it's network connected up to the Local ISPs for internet? And that you're concerned about both network penetration by outside (in the area) computers/users, and of surveliance of said traffic comming from your network through the local ISP?  I'm assuming, though that may be a screw up on my part, that your Army network managment is keeping a fairly tight control on stuff.  You arn't VPNing into networks back in the states?  I'd assume you'd be doing that.  I know when I'm not specifically at one of the local offices, I vpn into the DOI network before I do anything.  (Theoretially).  Using VPNs is a good way to avoid basic snooping.  Also for private mail addresses, using something like Hushmail isn't a bad call.  If you're thinking someone has gotten access to your computers... if it was physical access you have a bigger problem, and I'm ashamed at your security hehe.  If it's remote, and you have any evidence... root kit, etc.. I'd reformat the machine, and start anew. 

GeekSquadSF

I am an IA rep for the AOR, please shoot me a PM.