Yeah I’ve asked about that here too. The Army had weird (to me) rank structures. An Army E4 Specialist is not considered and NCO, while and Army E4 Corporal is.
So my question to the Army guys, can a specialist be promoted to E5 Sgt before holding the title of Corporal?
And how does a specialist become a Corporal?
@Cookie_ is correct. If you have a bachelor degree or higher, you enlist as a Specialist. From what I was told by guys at OCS who weren't prior service, E4s who assisted the DIs were made Cpl to automatically out rank everyone in boot camp. All OCS candidates were also promoted to Sgt while in OCS.
Otherwise, the only time I saw/head of Cpls was in the scenario @Cookie_ described.