The rules that use the vocabulary item "81mm mortar" are:

<specific_squad_type-not_creatable-sing>

81mm mortar

<specific_squad_type-creatable-sing>

81mm mortar

<specific_team_type-not_creatable-sing>

81mm mortar

<specific_team_type-sing>

81mm mortar

<specific_team_type-creatable-sing>

81mm mortar

<specific_squad_type-sing>

81mm mortar