Army Day in Iran
Army Day in Iran is held on April 18. This event in the second decade of the month April is annual. 
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Iranian Armed Forces are the largest in the Middle East in terms of active troops. Iran's military forces are made up of approximately 610,000 active-duty personnel plus 350,000 reserve and trained personnel that can be mobilized when needed, bringing the country's military manpower to about 960,000 total personnel.
The National Army Day, marked in Iran on April 18 every year, has traditionally been associated with massive street parades in the capital with participation of forces of all three branches of the army and exhibition of sophisticated weaponry.
Similar holidays and events, festivals and interesting facts
Day of National Heroes in Costa Rica on April 11 (Día de Juan Santamaría);
Day of Remembrance for the Fallen at the Battle of Dybbøl in Denmark on April 18
Brazilian Army Day on April 19 (Dia do Indio or Dia do Exército);
Khongjom Day on April 23 (Manipur, India);
Navy Day in China on April 23
Cavalry Day in Argentina on April 23
Kapyong Day on April 24 (Australia, Canada, New Zealand)