From the website:
Mortar Platoon (Airmobile) (VUS705) includes one Command M16 Rifle team, two Mortar sections each with two M29 81mm mortars with crew, one Small three-hole base & four Medium four-hole bases.
The battalion mortar platoon fields the new M29 81mm mortar. This is an improved version of the old WWII-era M1 81mm mortar with longer range. Perhaps as important to the crew, it was also 15 lb (7 kg) lighter than the older model.