The rules that use the vocabulary item "heavy" are:

<team_or_group_company_echelon>

mech heavy combat team

mechanized heavy combat team

opfor mech heavy combat team

opfor mechanized heavy combat team

swa mech heavy combat team

swa mechanized heavy combat team

swa tank heavy combat team

tank heavy combat team

<team_or_group_section_echelon>

tank heavy combat team headquarters

tank heavy combat team hq

<specific_vehicle_type-pl>

heavy assault bridges

heavy equipment transporters

<specific_vehicle_type-sing>

heavy assault bridge

heavy equipment transporter

<specific_vehicle_type-not_creatable-pl>

heavy assault bridges

heavy equipment transporters

<specific_vehicle_type-creatable-sing>

heavy assault bridge

heavy equipment transporter

<specific_vehicle_type-not_creatable-sing>

heavy assault bridge

heavy equipment transporter

<specific_vehicle_type-not_creatable>

heavy assault bridge

heavy assault bridges

heavy equipment transporter

heavy equipment transporters