Air Defense Force Day is observed in Armenia every year on the third Sunday of May. This professional holiday commemorates the formation of the Air Defense Force within the Armenian Armed Forces, which was established in 1994 following the dissolution of the Soviet Union. The day marks the end of the formation of Armenia’s air defense forces, which began during the First Nagorno-Karabakh War. Celebrations typically include official ceremonies and events recognizing the contributions of the Air Defense Force. The primary role of the Air Defense Force is to safeguard the country's airspace, utilizing various Soviet and Russian-made missile systems, with the S-300 being the main system for air security. Additionally, Armenia is integrated with Russian air defense forces and participates in joint exercises with the Collective Security Treaty Organization.