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Army Rank Flags (Thailand)

Commander-in-Chief of the Army
Commander-in-Chief of the Army 1938-1979
Commander-in-Chief of the Army -1938
Military Region Commander
Division Commander
Marshal (1912-?)
Field Marshal
General
Lieutenant General
Major General
Brigadier General

See also:

Commander-in-Chief of the Army 1979-

2:3 image by Suttipong Phuensaen, 19 Aug 2007

Commander-in-Chief of the Army 1938-1979

5:6 image by Suttipong Phuensaen, 19 Apr 2007

From the Singha Beer source:

The Flag of the Commander-in-Chief of the Army (B.E.2482) [1939 AD]
This flag resembles the "Trairanga", with the base [sic – probably "width"] measuring 5/6 of its length. [Similar to the Naval Jack, removing anchor and with clockwise and more detailed Chakra.]
In the middle stands a Chakkra beneath a yellow crown. The flag was first created in B.E.2479 [1936 AD], but was later changed to the version seen above, following a Royal Decree (Issue 2) concerning flags; issued in B.E.2481 [1938 AD]. The design of the flag currently in use, however, is a little different.

The description seems to imply that the ratio is 5:6. The image however shows a 2:3 flag like the regular Trairanga. In Flaggenbuch 1939 it appears as a 5:6 Trairanga with only a large, centered, white Chakkra, its diameter being 5/6ths of the hoist.

Santiago Dotor, 5 Nov 1999

Commander-in-Chief of the Army -1938

5:6 image by Suttipong Phuensaen, 19 Apr 2007

Military Region Commander

5:6 image by Suttipong Phuensaen, 19 Apr 2007

Division Commander

5:6 image by Suttipong Phuensaen, 19 Apr 2007

The Division Commander's flag has two stars with the RTA's emblem.
Suttipong Phuensaen, 19 Aug 2007

Marshal 1912-?

image by Miles Li, Jaume Ollé and Eugene Ipavec

based on the Singha Beer source

From the Singha Beer source:

The Marshal's Flag
This is a red flag with the Royal Sceptre crossed by sword in the center, above which stands a flaming Chakkra and the Greater "Mahapichai Mongkut" Crown.
The flag, first made its appearance in 2455 [1912 AD] during the reign of King Mongkut, was used by a Marshal in to Army. Since then, however, use of this flag has been discontinued.

There is some mistake here, since King Mongkut reigned 1855-1868.
Santiago Dotor, 5 Nov 1999

The mistake is that the king who invented Triranga flag in 1912 AD is King Mongkutklao (Rama VI). His father is King Chulalongkorn the Great (Rama V). King Mongkut mentioned in your article is actually his grandfather (Rama IV).
Nimit Chomnawang, 9 May 2002

It seems that both Mongkutklao and Vajiravudh are names given to King Rama VI.
Santiago Dotor, 10 May 2002

Field Marshal

image by Eugene Ipavec

General

image by Eugene Ipavec

Lieutenant General

image by Eugene Ipavec

Major General

image by Eugene Ipavec

Brigadier General

image by Eugene Ipavec