I learned the hard way
in Uncle Sam's Navy: there are certain things they want to see. Make sure they see them, and you'll have a remarkable degree of freedom.
At one point I was a junior medical officer, working about 100 hr-120 hr/week, exhausted, burnt out, pissed off....and it showed. In my face, in my uniform, in my bearing. And I was ridden hard, up before the XO more than a few times, until a kindly officer took me aside and gave me that advice. I began straightenng up, sharp uniform, good posture, all the litlle nit-picking trivial things tha military puts so much stock in. Seemed silly and petty to me, but they loved it. Inside of 4 months I was the Poster Boy, the doc selected to see the USMC 2-star when he came for a physical, etc...and without one bit of sucking up, just paying attention.
And the funny thing....I became proud of being sharply turned out, and my attitude improved, and I began enjoying military life more, and they gave me much more latitude in my actions, and when there was a conflict, they backed me up.
So go with it, don't fight it, try to be a good soldier and all will be well. And you'll be proud of it.