A Centurio Ordinarius commanded about 100 men, (although in reality a century was only 80 men). The English version of his title is Centurion.
The Commanding Officer .
Henry Knox
You let your commanding officer know
Joseph Hooker
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General Robert E Lee, Commanding Officer The Army of Northern Virginia, Confederate States of America Lt. General George Meade, Commanding Officer, The Army of the Potomac, United States
To change from Army National Guard to Active Army simply speak to your Commanding Officer about transfering.
Robert E. Lee
Meade commanded the Army of the Potomac during Gettysburg.
George Gordon Meade was the commander of the Union Army at Gettysburg.
A commander is an officer of any rank who is actually commanding an army/navy/airforce unit. A general is someone having that specific rank, but who is not necessarily actively commanding an army unit.
Make a complaint, in person, to his or her commanding officer.