𝐑𝐎𝐘𝐀𝐋 𝐓𝐇𝐀𝐈 𝐀𝐑𝐌𝐘 ɴᴀᴛɪᴏɴᴀʟ ᴅᴇꜰᴇɴꜱᴇ The core mission of the Royal Thai Army under the 2017 Constitution are to protect national sovereignty and all areas under the sovereignty of the Kingdom of Thailand, in order to maintain national stability, interests and Democracy with His Majesty the King as Head of State.