I entered in 1984, four man fire team (all M16s), sometimes 1 m203s, and we could upgrade in a squad to M60s.
I turned around and pulled my "Guidebook for Marines" (circa 1979) and what was issued to be in bootcamp off the shelf. It says (Chapter 29):
The current Marine Corps Rifle Squad... is made up of 13 men, a sergeant (squad leader) and three teams of four men each .. each fire team consists of a corporal (fire team leader), a lance corporal (automatic rifleman), and two privates or privates first class , one designated as grenadier/rifleman and the other as rifleman.
Picture included.
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