The United States Marine Infantry Battalion

Compared to their colleagues in The United States Army who adopted their basic organisational structure during 1943, and then adhered rigidly to it until the end of the war, USMC organisation underwent constant evolution between 1942 and 1945.  That has always made them a particularly interesting subject for someone like me, with a fascination for small unit organisation and development.  Aside from the 1944 era, I had found it frustratingly difficult to obtain detailed information on the various models of USMC Regimental organisation, but thankfully no more.

Thanks to two parties, firstly the Alfred M Gray Research Center, at the USMC Base at Quantico, and secondly John Thatcher (whose website can be seen at http://www.militaryresearch.org/ ) who between them have kindly furnished me with practically every relevant USMC Regimental Table of Organization issued during the Second World War.  That has allowed me to thoroughly update and improve this portion of the site, something I had been wanting to do for a long time.

The USMC amended its Regimental structure each year of the war, beginning with the 'D' Series Regiment of July 1942 and concluding with the 'G' Series of May 1945.  Overall the Regiment remained as a Headquarters & Service Company, a Regimental Weapons Company, and three Marine Infantry Battalions.  The changes within the Battalions themselves though were extensive, and in some areas they were completely different from their pre-war format.  

In July 1942 the Battalion consisted of a Headquarters Company, a Weapons Company and three Rifle Companies.  Companies were lettered consecutively across their Regiment of three such Battalions, excluding Headquarters Companies, with A to D in 1st Battalion, E to H in 2nd Battalion, and I to M in 3rd Battalion (there being no J Company).  The Heavy Weapons Companies were designated D, H and M, all other lettered Companies being Rifle Companies.  D, H and M Companies were all deleted with the 'F' Series organisation, but Rifle Companies retained their previous letter.

The United States Marine Battalion 1942 to early 1943

Derived from the following Tables of Organization - 

Rifle Company, Table of Organization D-1, dated 1st July 1942

Weapons Company, Table of Organization D-3, dated 1st July 1942

Headquarters Company, Table of Organization D-5, dated 1st July 1942

81-mm Mortar Platoon, Table of Organization D-2, dated 1st July 1942

Communication Platoon, Table of Organization D-4, dated 1st July 1942

The United States Marine Battalion early 1943 to mid 1944

Derived from the following Tables of Organization - 

Rifle Company, Table of Organization E-1, dated 15th April 1943

Weapons Company, Table of Organization E-3, dated 15th April 1943

Headquarters Company, Table of Organization E-4, dated 15th April 1943

The United States Marine Battalion mid 1944 to 1945

Derived from the following Tables of Organization - 

Rifle Company, Table of Organization F-1, dated 27th March 1944 (including Change 1)

Headquarters Company, Table of Organization F-4, dated 27th March 1944

Rifle Company, Table of Organization G-1, dated 1st May 1945

Headquarters Company, Table of Organization G-4, dated 1st May 1945

Assault Platoon, Table of Organization G-2, dated 1st May 1945

81-mm Mortar Platoon, Table of Organization G-3, dated 1st May 1945

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