What exactly is a proper Army haircut?

I'm currently a SGT in the Army, do to me being in a unique unit composed of everything from O3's all the way up to an O6, one of my immediate supervisors is a SGM. Everytime he see's me he tells me I need a haircut. I've panned back and forth though AR 670-1 and my haircut meets the army grooming standards. It has a tapered appearance all the time do to the fact that I cut my own hair it doesn't interfere with any head gear I wear. My hair never touches my ears in fact it would probably take me 6 months to grow my hair long enough to do so. It's always has a neatly appearance, not to mention my side burns extend only about 1/4 of the way down my ear probably about exactly in line with the outer corner portion of my eye. It's neatly tapered around my ears and blocked of in the back at the base of my neck. I've even attempted to measure my hair at its highest point and it was a few centimeters at the most. Now he says I will never make SSG in this unit until I start getting a proper haircut, I'm currently bald now becuase I was tired of catching flack from him and didn't want it to hinder my career. If any senior NCO or someone who has delt with this before could provide any insight it would be greatly appreciated. Thanks SGT J