Yeah, that's probably what's going on with the Dvar, but it's possible that their evolution has still been...accelerated somewhat. Regardless, my gut feeling is that genetically they're probably still compatible with homo sapiens, while Amazons might not be.
There are others in the campaign that I'd say have been put on assignments that would be typical for the Vanguard, even if those assignments are not the primary purpose of the Vanguard. The point of the Vanguard seems to be that they're a branch of the Star Union military that can be freely sent on deployments that involve never going home (or at least not until decades or centuries later).
Since their military is formed along typical Star Union lines, it makes sense that any 'normal' humans that remain in the 'present day' of the Star Union would have their military forces arrayed along similar lines. One could argue that non-Vanguard humans might have some Imperial vehicles instead of Vanguard vehicles (Buggies instead of Assault Bikes, Dragonflies instead of Gunships, Behemoths instead of Laser Tanks, Imperial Walkers instead of Vanguard Walkers), but in practice, these substitutions probably wouldn't have enough gameplay significance to be worth programming in, and it's entirely possible that the Paragons kept these units for their own armies.