DAZ3D has a free promotion for the month of it's software.
DAZ Studio 4 Pro, Hexagon 2.5, Bryce 7 Pro, plus a number of other packages are on sale for '$0'.
Looks like it ends at the end of the month. Sad news is that you still need to buy some of the character files to get the most benefit.
Not much available for the military crew unless you are into the fantasy realms. Has lots of applications for civilian areas.
Free items for Poser software at:- http://www.vanishingpoint.biz/freestuff.asp?StartNo=324
Autodesk Softimage Free Mod Tool software.