Evolution of the USMC Squad (WW1 to WW2)

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General Source:
• Sayen, John. (2001) “Battalion: An Organizational Study of the United States Infantry.” Working paper, Marine Corps Combat Development Command

Specific Sources:
• The United States Army in the World War Vol. 1, Organization p. 347; Manual of the Chief of Platoon of Infantry pp. 27-38
• “Table of Distribution for the Second Brigade to be effective 1 May 1923”
• USMC Organization Table 1P “Rifle Company, Marine Infantry Battalion (peace strength)” (Washington DC 1 Nov. 1934)
• USMC Organization Tables, “Marine Infantry Regiment, Marine Brigade (War Strength)” Table No. 21W and subordinate organizations (Wash. DC 1 July 1936).
• USMC Organization Table No. 1, “Rifle Company, Marine Infantry Battalion” (Washington DC 6 June 1938 updated 23 Aug 1939).
• Marine Corps Table of Organization D-1 “Rifle Company, Infantry Battalion, Infantry Regiment” (HQMC Washington DC versions dated 28 March 1941, 28 March 41/10 January 1942, and 1 July 1942).
• Marine Corps Table of Organization E-1 “Rifle Company, Infantry Battalion, Infantry Regiment” (HQMC Washington DC dated 15 April 1943).
• Marine Corps Table of Organization F-1 “Rifle Company, Infantry Battalion, Infantry Regiment” (HQMC Washington DC dated 12 January and 27 March 1944).
• Marine Corps Table of Organization G-1 “Rifle Company, Infantry Battalion, Infantry Regiment” (HQMC Washington DC dated 1 May 1945).
• Marine Corps Table of Organization D-81 “Parachute Company, Parachute Battalion, Marine Division” (HQMC Washington DC 28 March 1941 and 10 January 1942).
• Table APD-1, “Rifle Company, Destroyer (APD) Battalion” from February 1942 and Marine Corps Table of Organization D-172 “Rifle Company, Marine Raider Battalion” (Washington DC dated 12 February 1942 and 24 September 1942).
• Organization of Marine Corps Raider Battalions, dated 7 May 1942 plus attached table (Enclosure B) “Detailed Proposed Table of Organization and Equipment, Rifle Company, Marine Raider Battalion.”

Intro: (0:00)
World War I: (0:32)
Interwar: (4:23)
World War II: (7:52)