This is from bayonet strength.com and describes ranks from Corporal and above in the unit.
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The Armored Rifle Company – the Company retained a similar format, with a HQ, three Rifle Platoons, and now an Antitank Platoon. Company HQ continued to include both maintenance and service support elements.
Each Rifle Platoon was transported in five M3A1 halftracks, one per Squad, each vehicle mounting a machine gun and carrying a Bazooka. Platoon HQ functioned as a third Rifle Squad, and included a Lieutenant, Platoon Sergeant, Squad Sergeant and nine men. The two Rifle Squads each had a leader, assistant and ten men. Squads were commanded by a Sergeant and Corporal until early 1944, when they were promoted to Staff Sergeant and Sergeant respectively. One man in each squad was a driver, and carried a .45-cal submachine gun. With the exception of the Lieutenant and Platoon Sergeant with carbines, and one man with the M1903A4 Springfield scoped rifle, all other men in the HQ and Rifle Squads carried the M1 Garand. The HQ halftrack mounted a .50-cal machine gun, the Rifle Squads each having a .30-cal heavy machine gun.
The Mortar Squad served a single 60-mm weapon, its halftrack mounting a .30-cal machine gun, while the Machine Gun Squad had two M1919A4 or later A6 Browning light machine guns for dismounted use, and a halftrack mounted .50-cal weapon.
The Company's integral Antitank Platoon was similar to that in the Infantry Battalion, manning three towed 57-mm guns. Its three halftracks mounted one .30-cal and two .50-cal machine guns between them, Platoon HQ having a Jeep. Interestingly, some units in Europe were sufficiently unimpressed with the 57-mm that they reorganised the Platoon as a rifle unit. It would be impossible to describe the armament of these ad hoc groups, but it seems they fielded three Squads of twelve plus a HQ. It is a perfect example of the 'official' organisation being amended in action.
Company HQ was a purely command unit, with a halftrack and .50-cal HMG and Bazooka, plus a Jeep. The Maintenance Section added the same, and Supply Section a further Bazooka.
Summary