On 1 August 1959, it changed a status to the 1st Infantry Battalion of 21st Infantry Regiment, Queen Sirikit's Guard, and on 31 July 1968, moved the base to the Fort Nawamintharachini at Chonburi Province. On 1 October 2011, its unit strength changed from a three infantry battalion to a one mechanized infantry battalion and two elites infantry battalion.
Guards Pith Helmet with black plumes with the royal cypher of the queen.
Purple woolen top with black woolen mane embroidered with the queen's cypher on the wrist.
Black woolen trousers with two purple stripes per side.
Training
Selection
Trainee must serve in the 21st Regiment Queen's Guard or be permitted by the Royal Thai Army to attend training.
Training content
The Queen's Tigers run a training course every two years. Its duration is 23 weeks.
Physical and mental conditioning in preparation for the next phase (5 weeks): This phase focuses on basic abseiling, basic counterterrorism, basic defusing and disposal of bombs, basic hand-to-hand combat, basic parachuting, basic small unit tactics, fast tactical shooting, first aid, hand and arm signals, intelligence collection, marksmanship, tactical diving, and use a map and compass. Learn the languages of neighboring countries. NBCR on operations in contaminated environments. Physical exercises. Swimming. Only those who passing this phase move to the next phase.
Forest and mountain training (4 weeks): This phase focuses on infiltration by air and ground. Abseiling, counter-ambushes, exfil, defusing and disposal of bombs and land mines, forward observer, guerrilla warfare, infiltrate the area with a helicopter, jungle warfare, living off the jungle, mountain warfare, raiding tactics, reconnaissance tactics, riding a horse, SERE, small unit tactics, tactical emergency medical services, tracking tactics, use a map and compass, and unconventional tactics.
Sea phase (3 weeks): Water infiltration and tactical diving. Amphibious reconnaissance, amphibious warfare, coastal patrolling, helocasting, living off the sea, parachuting into water, and underwater diving.
Urban phase (5 weeks): Characteristics and choice of explosives and the amount and mode of use to minimize collateral damage, climbing in different situations using ropes, combat and patrolling techniques in urban areas, counterterrorism, CQB and CQC, fast-roping, hostage rescue, reconnaissance in urban areas, tactical shooting the PPC, tactical use of motorbikes, urban warfare, usage of explosives in the presence of hostages, use of explosives and other techniques for breaking doors, and use ladders climbing.
Air phase (6 weeks): Parachuting, parachute packing and problem solving.
Award for completion
Those who successfully complete the tiger training course receive a military capabilities plate from the queen. The metal plate is decorated with a purple heart and the queen's cypher. The lower part is a blue ribbon contain the honorific "Tiger Soldier". To both sides of the purple heart are tigers soaring above mountains, waves, and clouds.
Missions
Collect intelligence in a special gathering manner.
Counter-sabotage and riot control.
Counterterrorism and hostage rescue.
Create masses in the infiltration area.
Operating behind enemy lines.
Protection of The Royal Family and VIP.
Spearheaded the combat in battlefield.
Suppress insurgents in all terrains by infiltrating air, land, and water.
Political influence
In the 1990s, according to one academic, "...the Eastern Tigers amassed considerable wealth by trading gems with Cambodian Khmer Rouge insurgents based along the two countries' border, a racket which 'directly benefited'... some of its commanders. Within a decade, the Eastern Tigers dominated the Thai military."[4] The Queen's Guard have since had an inordinate influence on Thai politics. Former Queen's Guard commanders led the May 2014 Thai coup d'état that toppled the elected government.[8][4]