[Ryan Spock]

If they were real soldiers, why didn't they have any patches or ranks or name tags on any of their uniforms?

There are specific military regulations governing proper and improper use of the uniform. Using the uniform for commercial purposes is among those that are restricted. They can wear a stripped-down likeness, but not the full official uniform.

[Ryan Spock]

BTW, in the Army the specific regulation is AR 670-1, I believe. I qualify that with "I believe" because I've been out for several years and things may have changed, but that's probably still accurate.   :-)