What are the criteria for selecting leading cadres?

Is it an army cadre? Or local cadres? If I am an army cadre, I think I still have some say in the selection of leading cadres. I choose ability, or background, or financial resources and physical health conditions, as long as there are no serious diseases and no serious physical defects. Of course, under the condition of fair competition, it is advantageous to be elected as a cadre in better health, especially in the army. But in this social situation, health is secondary. I don't think it's necessary to worry so much. In fact, there is not much standard.