HTMS Phutthaloetla Naphalai is a high-performance frigate of the Royal Thai Navy, assigned to the 2nd Frigate Squadron. She belongs to the Phutthayotfa Chulalok–class (Knox-class) frigates, which were transferred from the United States. The ship plays a vital role in national defense and the protection of maritime interests, undertaking missions such as anti-submarine warfare, maritime patrols, and disaster relief. Equipped with guided weapons and an embarked helicopter, she represents a formidable naval asset and a long-standing symbol of pride for the Royal Thai Navy in safeguarding Thai waters.