I have made a whole bunch of military theme desktop wallpapers mostly of DOD photos I found that are public domain. I have been recently weeding through them and picking out the good ones, then I tweak them, digitally enhance them, and chop them to proper resolutions.
Have a look and use'em if you want, enjoy.
http://freelancekillers.com/gfx/wallpapers/ A PREVIEW OF WHAT'S AT THE ABOVE LINK 
Most are available in the following three sizes 1024x768, 1280x768, and 1280x1024
Feel free to make any comments...
I have a bunch more just not finished with them yet
If you have any photos you think I would be interested in using let me know, thanks
