Air Force Day is observed in Bulgaria every October 16, celebrating the country's air force and its historical significance. The holiday has been celebrated annually since 1963, with its origins tracing back to the early 20th century when Bulgaria established a balloon force in 1906. The date commemorates the first military mission performed by a Bulgarian aircraft on October 16, 1912, during the First Balkan War. On this day, pilots Radul Milkov and Prodan Tarakchiev conducted a reconnaissance flight over Edirne, marking a pivotal moment in Bulgarian aviation history. The flight lasted 30 minutes and involved inspecting the city while dropping grenades on the suburb of Karaagac. Air Force Day serves as a professional day for the Bulgarian Air Force, recognizing their contributions and achievements.