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

<specific_platoon_type-creatable-sing>

mech mortar

swa mech

swa mech mortar

<team_or_group_company_echelon>

mech heavy combat team

opfor mech heavy combat team

swa mech heavy combat team

<team_or_group_section_echelon>

mech battalion command group

<platoon_echelon>

logpac mech company team

<specific_platoon_type-not_creatable-sing>

mech mortar

swa mech

swa mech mortar

<specific_platoon_type-sing>

mech mortar

swa mech

swa mech mortar