Indeed, we didn't know the limits of jets, and if they could break the sound barrier, and the technology wasn't developed yet for breathing underwater. The SAGE engine in the incarnation for Generals, will not develop over time, so that rules out the better tech area. We know the limits of the sage enmgine, because objects like it don't interact with the actual physical world, thus it does not interact with something with unknown limitis, thus it limits are known.
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