The 1st and 3rd Amphibious Tractor Battalions were deployed as part of the 1st Marine 
Division to South Vietnam in 1965.  A battalion is made up of 2 Amtrac companies, each
with 4 Amtrac platoons.  An Amtrac company could transport an entire battalion of Marines.
It is important to keep this in mind when purchasing these formations.
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Technically the company HQ of the Amtrac companies should have 8 vehicles, but this
was impossible since 8 vehicles plus four platoons is more than the maximum ten units
per formation.  The three LTVP5 (CMD) command vehicles were stripped from the
formation to get it to fit.  The LVTR1 is an accurate part of the TO&E, but
this seperate formation is created for those not wanting to use this unit because it
is unrealistically modeled in game.