Military Map Symbology
Because someday you might find yourself called to read one.

Antiaircraft Artillery Armored Command Army Air Forces Artillery, except Antiaircraft and Coast Artillery Cavalry, Horse	Cavalry, Mechanized Chemical Warfare Service Coast Artillery Engineers Infantry
Medical Corps Ordnance Department Quartermaster Corps Signal Corps Tank Destroyer	Transportation Corps Veterinary Corps NOTE: Airborne units are designated by combining a gull wing symbol with the arm or service symbol: Airborne Artillery Airborne Infantry

Size Symbology
The following symbols placed either in boundary lines or above the rectangle, triangle, or circle enclosing the identifying  arm or service symbol indicate the size of military organization:

Squad Section Platoon Company, troop, battery, Air Force flight                   Battalion, cavalry squadron, or Air Force squadron           Regiment or group; combat team (with abbreviation CT following identifying numeral) Brigade, Combat Command of Armored Division, or Air Force Wing Division or Command of an Air Force                      Corps or Air Force                                     Army Group of Armies

Weapon Symbols on a Military Map

Machine Gun Gun Gun Battery Howitzer or Mortar Tank Self-Propelled Gun

Examples - Reading a Military Map
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 to. Letters or numbers above or below boundary lines designate the units separated by the lines

Company A, 137th Infantry 8th Field Artillery Battalion Combat Command A, 1st Armored Division Observation Post, 23d Infantry Command Post, 5th Infantry Division Boundary between 137th and 138th Infantry