U.S. National Guard Birthday
U.S. National Guard Birthday is held on December 13. This event in the second decade of the month December is annual. 
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Established in 1636, the National Guard is the oldest military organization in America. Its members serve during times of war and emergency.
Even though its not a federal holiday, the birthday of the U.S. National Guard celebrated on December 13 is an important event to note.
Similar holidays and events, festivals and interesting facts
Croatian Air Force Day on December 12 (Croatia);
Ground Forces Day on December 12 (Ukraine);
National Wreaths Across America Day on December 20
Armed Forces Day in the Philippines on December 21
Armed Forces Day in Vietnam on December 22
Victory 1956 Day in Egypt on December 23
Operational Servicemen Day n Ukraine on December 23 (Day of all level operational control structures servicemen)