I feel like this would work better as an H manga.
Also, I don't have the contexts, but I'm gonna give my thoughts.
First off, why did he appoint a traumatized civilian as a commander? She doesn't seem that trained and she wants out of her position.
She literally got a bunch of her soldiers...
Hopefully there's an explanation for why only women can us the IS.
Also, I don't really like the design for the IS.
It irks me to see the lack of protective armour to the front, it'll only take a lucky shot. Also, I don't think I saw any helmets.