No, it didn’t. The system looked at two things; how much your boss liked you and how much your boss’s boss likes you. Also slightly if you have a graduate degree (doesn’t matter which m. Worthless for profits count).The higher in rank the less open slots and the more competitive it becomes. Colonels got to be colonels for good reason. The system worked well.
Zero look at combat results, operational metrics, etc.
What matters is making your boss like you, when said boss rotates every 18 months or so. Which means in order to succeed you need to be an empty suit chameleon who can woo a different boss every 1.5 years or so and the boss’s boss.
That’s why so many senior officers are virtue signaling so hard. They’re empty suit sycophants whose main skill is reading the political room and pandering to it.