Most of the flags used by the Thai military today were stipulated in the Flag Act of 1979 (พระราชบัญญัติ ธง พ.ศ. ๒๕๒๒).[1] [2]
Flag | Date | Use | Description |
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| 1979–present | Identification flag for an Army Corps | Diagonal red and pink flag with the emblem of the Royal Thai Army in the canton, with three stars (arranged horizontally). |
| 1979–present | Identification flag for an Army Division | Diagonal red and pink flag with the emblem of the Royal Thai Army in the canton, with two stars (arranged horizontally). |
| 1979–present | Identification flag for an Army Regiment | Diagonal red and pink flag with the emblem of the Royal Thai Army in the canton. |
| 1979–present | Identification flag for a Cadet Regiment | Diagonal red and yellow flag with the emblem of the Royal Military Academy in the canton. |
| 1979–present | Identification flag for a Special Forces Unit | Diagonal red and pink flag with the emblem of the Royal Thai Army in the canton and the emblem of the Special Forces in the pink half. |
| 1979–present | Identification flag for a Flying Unit | Diagonal red and pink flag with the emblem of the Royal Thai Army in the canton and the emblem of the Flying unit in the pink half. |
| 1979–present | Identification flag for an Infantry Battalion | Diagonal red and white flag, with a red line running counter diagonal, with the emblem of the Royal Thai Army in the canton. |
| 1979–present | Identification flag for a Special Forces Battalion | Diagonal red and white flag, with a red line running counter diagonal, with the emblem of the Royal Thai Army in the canton and the emblem of the Special Forces in the center. |
| 1979–present | Identification flag for an Cavalry Battalion | Diagonal red flag, with a white triangle on the right half and Wedgwood blue triangle at the bottom, with the emblem of the Royal Thai Army on the canton. |
| 1979–present | Identification flag for an Artillery Battalion | Diagonal red flag, with a white triangle on the right half and yellow triangle at the bottom, with the emblem of the Royal Thai Army on the canton. |
| 1979–present | Identification flag for a Cadet Battalion | Diagonal red flag, with a white triangle on the right half and yellow triangle at the bottom, with the emblem of the Royal Military Academy on the canton. |
| 1979–present | Identification flag for an Engineer Battalion | Diagonal red flag, with a white triangle on the right half and black triangle at the bottom, with the emblem of the Royal Thai Army on the canton. |
| 1979–present | Identification flag for a Signals Battalion | Diagonal red flag, with a white triangle on the right half and purple triangle at the bottom, with the emblem of the Royal Thai Army on the canton. |
| 1979–present | Identification flag for a Transport Battalion | Diagonal red flag, with a white triangle on the right half and maroon triangle at the bottom, with the emblem of the Royal Thai Army on the canton. |
| 1979–present | Identification flag for a Medical Battalion | Diagonal red flag, with a white triangle on the right half and green triangle at the bottom, with the emblem of the Royal Thai Army on the canton. |
| 1979–present | Identification flag for a Military Police Battalion | Diagonal red flag, with a white triangle on the right half and navy blue triangle at the bottom, with the emblem of the Royal Thai Army on the canton. |
| 1979–present | Identification flag for an Ordnance Battalion | Diagonal red flag, with a white triangle on the right half and orange triangle at the bottom, with the emblem of the Royal Thai Army on the canton. |
| 1979–present | Identification flag for a Flying Battalion | Diagonal red flag, with a white triangle on the right half and sky blue triangle at the bottom, with the emblem of the Royal Thai Army on the canton and the emblem of the Flying unit in the center. |
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Flag | Date | Use | Description |
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| 1892–1908 | Flag of the Royal Siamese Army | Red flag with the Coat of Arms of Siam at the centre. Created during the reign of King Chulalongkorn (reigning 1868–1910) for the first modern equipped land force in Siam. |
| 1908–1936 | Flag of the Royal Siamese Army | Red flag with a white elephant in regalia. With the appropriate royal cypher in the top canton. |
| 1936–1979 | Flag of the Royal Thai Army | Trairanga with the old emblem of the Royal Siamese Army at the center. The emblem depicts an unalom, inside a chakra. Inside the rim of the chakra is written the phrase: สละชีพ เพื่อชาติ (Willing to give-up life for country). The chakra is surrounded by rays of light. |
| 1936–1938 | Flag of the Commander of the Royal Siamese Army | Trairanga in the ratio of 5:6, with a white Chakra at the center. |
| 1938–1979 | Flag of the Commander of the Royal Thai Army | Trairanga in the ratio of 5:6, with a Chakra and the Great Crown of Victory in yellow. |
| 1892–1897 | Regimental Colours of the Royal Siamese Army. | From the Flag Regulations for the Kingdom of Siam of Rattanakosin Era 110, granted in 1892 A.D. White, in the upper right hand corner of which is the seal of office of the regimental namely: - a small red rectangular ground one sixth of the length by one sixth of the breadth of the flag. In the center of this small red ground is a pedestal of yellow colour on which stands a white, elephant, caparisoned, and facing the flag stall. The colour of the ground of the seal of office varies according to instructions. These Colours are to be used at all Royal festival and receptions, also in Military expeditions. |
| 1908–1910 | Royal Siamese Army unit colours | Square red flag with a white elephant in regalia. With the Royal Cypher of King Chulalongkorn in the canton. The unit's name is written around the cypher. |
| 1910–1925 | Royal Siamese Army unit colours | Square red flag with a white elephant in regalia. With the Royal Cypher of King Vajiravudh in the canton. The unit's name is written around the cypher. |
| 1925–1935 | Royal Siamese Army unit colours | Square red flag with a white elephant in regalia. With the Royal Cypher of King Prajadhipok in the canton. The unit's name is written around the cypher. |
| 1936–1949 | Royal Thai Army unit colours | A square national flag of Thailand (also called the Trairanga). With the old emblem of Royal Thai Army in middle, surrounded below with the unit's name, and the Royal Cypher of King Ananda Mahidol at top canton. |
| 1949–1979 | Royal Thai Army unit colours | A square Trairanga with the old emblem of Royal Thai Army in middle, surrounded below with the unit's name, and the Royal Cypher of King Bhumibol Adulyadej at top canton. |
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Flag | Date | Use | Description |
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| 1897–present | | Navy blue flag in the ratio of 2:3, with the emblem of the Royal Thai Navy. |
| 1936–present | | Navy blue swallow-tailed flag in the ratio of 2:3, with the emblem of the Royal Thai Navy. |
| 1936–present | Flag for the Commander of a Squadron | Navy blue swallow-tailed flag with the emblem of the Royal Thai Navy, the tip of the flag is white. |
| 1936–present | Flag for the Commander of a Base | Navy blue swallow-tailed flag with the emblem of the Royal Thai Navy, the tip of the flag is sky blue. |
| 1936–present | Flag for the Commander of a Coastal Station | Navy blue swallow-tailed flag with the emblem of the Royal Thai Navy, the tip of the flag is red. |
| 1936–present | | Navy blue swallow-tailed flag with the emblem of the Royal Thai Navy, the tip of the flag is yellow. | |
Flag | Date | Use | Description |
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| 1936–1939 | Flag of the Royal Siamese Air Force Division | Trairanga with the emblem of the Royal Siamese Air Force Division (name later changed to Royal Siamese Air Force in 1937) on a blue background in the center. |
| 1939–1946 | Flag of the Royal Thai Air Force | Trairanga with the old emblem of the Royal Thai Air Force on a blue circle in the center. Top right is the Royal Cypher of King Ananda Mahidol (1935–1946). |
| 1939–1946 | Flag of the Royal Thai Air Force | Trairanga with the old emblem of the Royal Thai Air Force on a blue circle in the center. Top right is the Royal Cypher of King Bhumibol Adulyadej. |
| 1946–1979 | Flag of the Royal Thai Air Force | Trairanga with the emblem of the Royal Thai Air Force on a blue circle in the center. Top right is the Royal Cypher of King Bhumibol Adulyadej. |
| 1936–1979 | Flag of the Commander of the Royal Siamese Air Force | Sky blue flag in the ratio of 5:6, with a yellow Chakra with two wings, topped by the Great Crown of Victory. |
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Flag | Date | Use | Description |
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| 1885–1887 | Standard of the Royal Siamese Army during the Haw wars (ธงจุฑาธุชธิปไตย: Thong Chudhadhujdhippatai) | A red Flag with the Royal Coat of Arms of Siam at the center, with a three borders depicting the blades of a chakra. The flags was presented to Chao Phraya Surasakmontri (Cherm Saeng-Chuto) by King Chulalongkorn in 1885 as a colour for the Siamese army sent to fight the Haw rebels in the north of the country, the war ended in 1890.[3] [4] |
| 1912–1925 | Standard of the Royal Siamese Army under King Vajiravudh (ธงมหาไพชยนต์ธวัช: Thong Mahapachayonthawat) | Created in 1912 by King Vajiravudh. The king intended to have the flag paired with that of his father's. The standard is red with a black rectangle, in the center is the personal symbol of the King. It depicts the Vajra on a two-tiered pedestal with lightning rays emanating from it. Flanked on either side by seven-tired royal umbrellas. |
| 1917–1918 | Standard of the Siamese Expeditionary Force, Obverse | Trairanga defaced with a red disc containing dressed white elephant, facing a flagpole. Briefly, its appearance is the same as naval ensign, but both red stripes contain a portion of the 6th century Chant to the Buddha's Victories written in Pali using Thai script: "พาหุํสหัส์สมภินิม์มิตสาวุธัน์ตํ ค๎รีเมขลํอุทิตโฆรสเสนมารํ ทานาทิธัม์มวิธินาชิตวามุนิน์โท ตัน์เตชสาภวตุเมชยสิทธินิจ์จํ". This flag was carried by the Siamese volunteer corp sent to the war in Europe in 1918, the force and the flag was part of the Allied victory parade under the Arc de Triomphe, in Paris 1919. |
| 1917–1918 | Standard of the Siamese Expeditionary Force, Reverse | Trairanga defaced with a red disc containing King Vajiravudh's personal cypher. The emblem features Thai acronym "ร.ร." and Thai digit six ("๖"), both are displayed under the glowing crown. Both red stripes of the flag contain the same inscription as the obverse. |
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