Police are civilians.
Army, Navy, and even Air Force are not civilians.
Marines get to not be civilians (though for most of their history they were the Navy’s police force).
Yet another facet of the problem. Ask a cop if he is a civilian and see what kind of answers you get. They may not consider themselves military (yet) but they certainly consider themselves separate from the rest of us. That is reflected in the “do whatever it takes to get home” attitude that is taught to police forces throughout the nation.