Helmet insignia used by the 101st
Airborne Division
Basic Military Map
Symbols
Symbols within a rectangle indicate a military unit, within a
triangle an observation post,
and within a circle a supply point.
Military Units-
Identification
Size Symbols
The following symbols
placed either in boundary lines or above the rectangle, triangle,
or circle inclosing the identifying arm or service symbol indicate
the size of military organization:
Examples
The letter or number to
the left of the symbol indicates the unit designation;
that to the right, the designation of the parent unit to which it
belongs.
Letters or numbers above or below boundary lines designate the units
separated by the lines:
Weapons
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