Royal Thai Armed Forces Day is observed in Thailand on January 18 each year, commemorating the victory of King Naresuan in a historic elephant duel against the Burmese Crown Prince Mingyi Swa in 1592. This day was originally celebrated on January 25 but was changed in 2007. The holiday honors the Royal Thai Armed Forces, which include the Royal Thai Army, Royal Thai Navy, and Royal Air Force, tasked with defending the country's independence and protecting the monarchy from domestic and foreign threats. Citizens of Thailand, particularly males over 21 who have not completed reserve duty, are subject to a random draft for military service, with full-time service lasting 24 months and volunteer service lasting 18 months depending on education. The day serves as a professional observance for the military and recognizes their role in safeguarding the nation.