Service Day in the Indonesian Air Force is observed on July 29 each year, commemorating the tragic 1947 Yogyakarta Dakota C-47 accident that resulted in the deaths of eight individuals. This day honors the memory of the victims, including Agustinus Adisutjipto, the first Indonesian pilot and founder of the Indonesian Air Force, and Abdul Rahman Saleh, a physician and revolutionary. The observance originated from the incident where a humanitarian flight, approved by Dutch and British forces, was shot down by Dutch aircraft while delivering medical supplies. Following the crash, which left only one survivor, Abdulgani Handonotjokro, the Indonesian Air Force established Service Day to celebrate the sacrifices made by its members for the nation. The day is marked by solemn remembrance ceremonies at air force bases across Indonesia, reflecting on the commitment of air force personnel to their country and its people.