The President is Commander-in-Chief of all US armed forces.
The current US President .
Usually, a Captain.
There were eleven "field armies" in the US Army during WWII. Of these two, the Second US Army and the Fourth US Army, remained in the continental US throughout the war, functioning as training commands. Additionally the 4th US Army was responsible for defending the west coast of the US against attack.
General officers (1- to 4-star) command brigades or larger units. A 4-star general (5-star during wartime) commands the entire US Army.
seven
yes
One who commands a Carthaginian army.
The executive branch
yes
A Corps Commander is a lieutenant general.
The commander-in-chief of all the US Armed Services (including the Army) is the current President of the United States. The senior military officer in the U.S. Army is the Army Chief of Staff. However, the current force structure usually has the various Operational Commands (i.e. the actual military theater-of-operations commands, verses the logistical, administrative, or procurement sections) report to the Chairman of the Joint Chiefs of Staff instead of the Army Chief of Staff.
The US Armed Forces are coprised of five separate branches: Army, Navy, Air Force, Marines, and Coast Guard. None of the branches commands the Armed Forces, that job is reserved for the President of the United States, as the Commander in Chief of the US Armed Forces.