Enlisted
E-1 = Private
E-2 = Private Second Class
E-3 = Private First Class
E-4 = Specialist/Corporal
E-5 = Sergeant
E-6 = Staff Sergeant
E-7 = Sergeant First Class
E-8 = Master Sergeant/First Sergeant
E-9 = Sergeant Major/Command Sergeant Major
Warrant Officer
WO1 = Warrant Officer 1
CW2 = Chief Warrant Officer 2
CW3 = Chief Warrant Officer 3
CW4 = Chief Warrant Officer 4
CW5 = Chief Warrant Officer 5
Officer
O-1 = Second Lieutenant
O-2 = First Lieutenant
O-3 = Captain
O-4 = Major
O-5 = Lieutenant Colonel
O-6 = Colonel
O-7 = Brigadier General
O-8 = Major General
O-9 = Lieutenant General
O-10 = General
Lieutenant Colonel.
General of the Army.
Chief of Staff is the title of the highest ranking officer of the US Army. He holds the rank of General, which is an 0-10 / 4 star rank. The title of Commander-In-Chief is given to the President of the US and is the commanding authority for all military forces, but the holder of this rank, while often having served in the military, is not a military officer by virtue of title.
There is no rank called "colonial." The rank "Colonel" is below General and above Lt. Colonel, Major, Captain, and so on.
No, there is no rank of commander in the Army. In the Army commander is a title, not a rank. In the Navy, there is a rank of Commander, it is the equivalent of Lt Colonel or O-5.
Sergeant Major of the Army is the highest rank NCO.
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.
In the US Army, General.
The highest Non-Commissioned Officer rank in the US Army is Sergeant Major of the Army. The current SMOA is Kenneth O. Preston.
In the US Army, there's two ranks - Specialist, and Corporal. In the US Marines, it's just Corporal. The Specialist rank in the Army is not an NCO rank, whereas Corporal is.
Lieutenant Colonel.
General of the Army.
Usually, a Captain.
captain
In the US Army, a full bird refers to a Colonel, which is the rank between Lieutenant Colonel and Brigadier General.
General of the Army (five stars). However, this is a special rank used only in wartime. Currently, General (four stars) is the highest achievable rank.
His rank is Captain, his pay grade is 0-3.