In Thailand, the RTARF’s missions include defending the country’s territory and sovereignty, protecting the monarchy, ensuring internal security, and responding to natural disasters; it also plays a large role in domestic politics and has attempted as many as 20 coups since the fall of absolute monarchy in 1932, the most recent being in 2014

since 2004, the military has fought against separatist insurgents in the southern provinces of Pattani, Yala, and Narathiwat, as well as parts of Songkhla; the insurgency is rooted in ethnic Malay nationalist resistance to Thai rule that followed the extension of Siamese sovereignty over the Patani Sultanate in the 18th century; the insurgency consists of several armed groups, the largest of which is the Barisan Revolusi Nasional-Koordinasi (BRN-C): since 2020, Thai officials have been negotiating with BRN, and has parallel talks with an umbrella organization, MARA Pattani, that claims to represent the insurgency groups; since 2004, violence associated with the insurgency has claimed more than 7,000 lives; the Thai Government has had as many as 100,000 military and paramilitary forces deployed in the south to combat the insurgency

Thailand has Major Non-NATO Ally (MNNA) status with the US, a designation under US law that provides foreign partners with certain benefits in the areas of defense trade and security cooperation; the Thai and US militaries host the annual "Cobra Gold" multinational military exercises in Thailand; the exercise is one of the largest multinational exercises in the Pacific region (2024)