To start with the nice points :
* the story was interesting to read, and I definitely would have liked to read more
* The first line is good, though it would probably have been more powerful on it's own
* I like the one line paragraphs, they do manage to convey important moments well
* The battle manoevers are nicely rendered
Now, some points bothering me:
* Exposition, exposition, ... The beginning is really tough to read, and the peculiar nouns used do not make it any easier. This was visible even in the short introduction you wrote on this post. If you're going to keep the *mejj nouns, maybe you could wait a little more before introduce the whole bestiary. Maybe just naming them by their function at the beginning would work better (healing-squad, bombing-squad, ...)
* I feel like "Jhuz the Standard" does clash a little with the other titles you've given (Prefect Gaitu for instance). It would have felt more natural as Standard Jhuz.
* Some things seemed out of character, especially Jhuz calling the Prefect by his name. For military types, even under pressure, I don't see them calling a superior officer by their names, and not their title.
* I'm not a big fan of swearing, and some seemed a little out of place, or too much like modern-swearing (fuckers).
* we don't feel the other men's scorn for the protagonist at the beginning, and near the end when it is really shown to us, it doesn't feel right.
What I would have liked:
* This is a character with acute vision surveying a battlefield : I would have loved a more sensory-full description of the battle. I both want to feel it, and to grasp the entire battlefield, so that it feels more epic.
* A tad more information about the Chell (not the full story, mind you), but a little more discussion showing me why they're not supposed to be a threat, and another showing the incomprehension after their attack
All in all, nice first chapter. Looking forward to the next.