If you are "deployed" then I'm presuming you may be on a Sat link for internet and these programs may be bandwidth hungry. Whoever manages it may come looking for you. (Just saying like, so it's not a surprise)
I use the ExpatShield software. Expat Shield
It is generally very good but will go down every few months for a few days. It is wholly ad supported but that means the occasional porn popup ending up on your history. So do delete your history each time you use it if your 0A also uses your computer.