not considerable.
yes there can be staff for a pastry chef
In the US Army, it's SSG.
Lieutenant General Adna Chaffee who was the second US Army Chief of Staff.
Yes. Staff Sergeant is pay grade E6 in both the US Army and US Marine Corps (it's pay grade E5 in the Air Force).
the chef preparing staff meals
General Omar Bradley.
General Douglas MacArthur.
As of 10/2/17, General Mark A Milley is the current Chief of Staff of the US Army.
The General Staff of the Army assists the Army Chief of Staff in carrying out the duties of his job
Major General Leonard Wood.
General Malin Craig.