According to Bob Dalton and this announcement, VBS2 Lite US Army was to be available to anybody without restrictions. It was later recognized that the EULA contains language that restricts access to non-DoD personnel. A new version of VBS2 Lite US Army, with a corrected EULA was to be released ... still waiting.
Besides US Army units, VBS2 Lite US Army included an Afghanistan map.
If you know anything about VBS2 Lite US Army, please comment using the link below.
P/S: Nothing gives me more pleasure than filing this entry under an "ArmA 2" tag. I don't know what the hell is wrong with the overzealous, Spanish-inquisition moderators at Bohemia Interactive forums who continuously shun people for posting about this simulator under excuses of topic (this is not ArmA 2) and now legality (apparently is not legal to even talk about this). It feels good to be both right and in control.