No, there wasn't.
There is no such rank as Medic Sergeant Major of the Army. There is a Sergeant Major of the Army and regardless of his specialty, it is just SMA.
Poe was discharged from the army with the rank of Sergeant Major.
Gunnery Sergeant is pay grade E7, and the equivalent Army rank is Sergeant First Class.
Sergeant is a higher rank than Corporal.
Master Sergeant in the Army is pay grade E8. First Sergeant is the other Army E8 rank.
Sergeant Major of the Army is the highest rank NCO.
YES
Sergeant Major of the Army
Anyone in the US Army can lose their rank - in the late 1990s, the Sergeant Major of the Army was demoted. It's not as easy for an SFC to lose their rank as, say, a Specialist or Sergeant, but it can happen.
The highest ranking officer is General of the US Army, commonly referred to as a five star General. The last man to hold this position at five-star rank was General of the Army Omar Bradley. The Chief of Staff's rank insignia is no different from any other General's; he wears the Chief of Staff Identification Badge. No one currently holds this position. Currently the highest ranking officer in the US Army is Chief of Staff, General (four star) George W. Casey, jr. The highest ranking enlisted person is Sergeant Major of the Army. the current SMOA is Kenneth O. Reston. His rank is different from any other sergeant major's: it has two stars between the stripes and rockers whereas a sergeant major or command sergeant major's rank only has one.The highest rank in the US Army is General of the Army, 5 stars (O-11).This rank is not permanently filled. The higher, Congressionally-authorized rank of General of the Armies of the United States is a rank accorded to two individuals: John J. Pershing and George Washington (Washington was posthumously increased in rank in 1976, and will always be senior to any US officer).The General of the Army, as with the heads of all US military branches, reports to the civilian heads of the executive branch and the Commander-in-Chief (the President of the United States).Please see links below for amplification and pay related materials.
No, there is no rank of "Major Sergeant" in the Army Rangers. The ranks in the U.S. Army Rangers follow the same structure as the rest of the Army, including ranks such as Private, Sergeant, Lieutenant, Captain, and Colonel.
It is spelled sergeant (a non-commissioned military rank, or senior policeman).