A flag officer is a commissioned officer in a nation's armed
forces senior enough to be entitled to fly a flag to mark where
the officer exercises command. The term usually, but not
exclusively, refers to the senior officers in an English-
speaking nation's navy, specifically those who hold any of the
admiral ranks; in some cases it applies also to those holding
the rank of commodore. In U.S. usage it is additionally applied
to Coast Guard officers and general officers in the U.S. Army,
U.S. Air Force, and U.S. Marine Corps entitled to fly their own
flags. General usage  The generic title of flag officer is used
in several modern navies and associated units to denote those
who hold the rank of rear admiral (or its equivalent) and above,
also called "flag ranks"; in some navies, this also includes the
rank of commodore. Flag officer corresponds to the generic terms
general officer (used by land and some air forces to describe
all grades of generals) and air officer (used by other air
forces to describe all grad