No an air force cadet does not have to stand at attention when talking on the phone.
In the context of business operations, the abbreviation "adm" typically stands for "administration."
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United States Air Force
Air Force One signifies any air craft operated by the US Air Force that is currently carrying the President of the United States on board.
Royal Australian Air Force
Navy, Army & Air Force Institutes
Professional Development Guide
United States Army Air Force
Chief Medical Officer
In the U.S. Air Force, AS can stand for Airlift Squadron.
Army Air Force as the US Air Force as it's own entity hasn't been created yet.