Since my father retired Air Force, I was Army and Army National Guard and my son is Navy, from my experience, unless you are in a Navy rate that is very large or has a lot of turnover, the Army promotes quicker. For example, through E4 in the Army is almost automatic since it doesn't require a slot like it does in the Navy and no board. Even E5 is almost automatic these days as long as you have all the schools and qualifications. From my point of view, the NCO school system is more understandable in the Army. Still, like the Navy, when you get to E6 you are competing for positions, so if you are in a small MOS, promotion can be very slow at the top.
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