What we saw until now was her basic personality. Military training somewhat changes people, especially leadership training. I very much doubt she had had any sort of training back in her home town. So, her behavior was a combination of some very dubious elements, like the surge of power of having a gun in your hands plus having been placed into a position of responsibility. Add to that the intense patriotism, and you get a ruffian. However, now that she's in proper military environment, she should get all her delusions hammered out of her.

In the end being a sergeant is harder than being a grunt, so let's hope this series manages to maintain (or create) some sensibility in the future eps.