Oddly enough, I bought this historical TO&E to help me work on a Science Fiction "'verse". Knowing that different cultures/worlds almost certaintly would use different TO&E's I wanted to use something with a historical basis.
If one is basing a science fiction campain (or an arc of such a thing) on a civil war on a planet, this can be used as the basis of one sides "Interstellar" support, just as the historical brigades did for the Republican sides in the Spanish Civil war.
If one wants to stay firmly on the Earth, it is still useful for those systems that break down to company/special weapons team level. I am also glad that the various supporting arms/units are shown.
Overall I am quite satisfied with this purchase and will be comming back to check other eras/nations as my needs require