So I guess it depends on what our best techs are. We could have possibly phalanx style combat if we have really good shields. We could have a focus on IFVs if we got some sort of tech that allows vehicles to enhance our own. A stealth suit could lead to a much more fluid, and generally more IRL modern style fighting. We might have a few mechs, but unless there is a major gap between mechs and tank tech, we probably would still use tanks mostly, instead of mechs. If we are insanely lucky, we might have a fortress focused doctrine abusing highly advanced construction tools to fortify at insane speeds, or some other really good useful tech.