You are also confused in linking medical standards and compliance with height/weight fitness standards. The latter is administrative in nature, and up to the individual's commander. Separation for failure of the fitness test standards is administrative, and not medical.
Also, the recently enacted Wounded Warrior legislation prohibits separation if an individual remains fit for duty (of some kind), but is not deployable. An example would be a soldier who loses a limb in combat, but still could function in some other role. Unfortunately, in some cases, this legislation has been interpreted more broadly to include those individuals who have diabetes, heart disease, cancer, etc. As long as they can do their job, the current interpretation as I understand it is that they cannot be separated. It has led to a lot of confusion.
My original point referred to CAP members who wear a uniform with rank, but are not apparently required to meet any other standards for wear of the uniform, military customs and courtesies, etc, like polished boots, haircuts, saluting, etc.
My own impression is the same in sensing that they are cliquish and resistant to members of the military participating or helping in their training,yet who would be a better recruiting resource than to have some pilots, PJ's, security forces, or other people come and give talks?