Yep, I’m not talking about the 344th Tactical Postal Squadron.
There's no such thing. There are Security Forces Squadrons, Mission Support Squadrons, Logistics Support Squadrons, Civil Engineering Squadrons, Communications Squadrons, Maintenance Squadrons and various others that often have Majors as commanders.
So, your point about the relative ease of making O-5 in the Air Force is gone.
I'll tell you this much, every O-3 and O-4 that was hit with the is RIF has at least a Bachelors Degree. You can't say that for the Navy though, can you?
My point is that in the Air Force the average fighter squadron has three times as many planes as a Navy squadron and is commanded by an O-6. The Navy unit is commanded by an O-5 and there are six-seven Navy squadrons in an Air Wing where you run into the first two O-6s.
As far as bachelor's degrees go, line officers all have degrees except for a small number of naval aviation cadets that have to get their degrees before they make O-4. We do have some limited duty officers that are brought up from the enlisted ranks for their technical expertise, but the vast majority of them have degrees.