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Those military personnel who converted willingly maybe wanted to keep their old units insignia or something. Or the seventh division fought bravely against the combine that they gained respect from them or just to remind every human on Earth of the Combine's overwhelming power through rememberance of the 7 hour war.
...or the logo just looked cool, happened to also be a real-life military insignia and Valve used it for kicks. Enough with the stupid theories! Not everything has a meaning!
The unit designation was a minor fixup that we took the opportunity to do at the same time. Initially, we hoped that the symbols & numbers would be dynamic, and hence different on every soldier & squad to show that they really were a specific member of a specific unit. This feature never ended up getting in, so we changed the number into a more generic symbol that could feasibly be on every soldier. Nice job noticing the change, by the way. Most people don't really pay that close attention!