The narrative must be maintained, comrade!
Who fights for XYZ must be able to fight and not to fight,
to say the truth and not to say the truth,
to render and to deny service,
to keep a promise and to break a promise,
to go into danger and to avoid danger,
to be known and to be unknown.
Who fights for XYZ has of all the virtues only one:
that he fights for XYZ.
In theory. In practice (history is full of it), the castes develop overnight. A group of individuals has to make decisions and manage the oversight and record keeping, etc. This leads to corruption and a de-facto aristocracy.
Is that not privilege? Why could a government official get a car while a normal person would have to wait years?
Children of government officials got preference at the best universities and jobs. Is that not aristocracy?
Communism is all about privilege — everyone is equal but some people are more equal than others.