A gentleman, like a virgin, either is or is not. The two are mutually exclusive traits. My experience has taught that lieutenants are an evenly mixed bag of both. The latter will most assuredly rise within the system. The former make great fathers, teachers, lawyers, and pastors.
Some gentlemen make it into the field grade officer ranks of major, lieutenant colonel, and colonel.
Very few make general. I can think of only one, Omar Bradley. He was General Robert E. Lee. Most of the gentlemen in the military wear stripes. I wish every platoon and every company were commanded by a gentleman, every division and corps, commanded by an officer.