Here is list of few military codename generators that I have used.
http://www.ubique.ch/codename/
That is the generator I used mostly when making the 200+ missions for PMC Fury, naming them was a total nightmare, I must have hammered that site for thousands of times.
http://www.codenamegenerator.com/
This is brand new site for me, so far it looks at start quite complex, but in the military codenames and simplifying the creation of them it lacks a bit. I mean I don't need any microsoft codenames to be used, also the drop downs only allow you to choose one, not like "use all" but I guess that would be proper as there indeed are those unusable categories.
http://www.cimmerians.org/CICKA.html
Is quite OK site, some airsoft hobbyists I believe, that site is easy to use, just refresh once and you are provided 10 codenames right away.
If anyone has more codename generator links, please post them here.