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

<i_f_v-pl>

m83a 60mm mortars

m83a mortars

mt-lb with 82mm mortars

mt-lb with eighty two mortars

opfor medium mortars

self propelled 82mm mortars

self propelled eighty two mortars

sp 82mm mortars

sp eighty two mortars

swa 60mm mortars

swa mt-lb with 82mm mortars

swa mt-lb with eighty two mortars

<other_target-pl>

mortars

<other_target>

mortars

<i_f_v>

m83a 60mm mortars

m83a mortars

mt-lb with 82mm mortars

mt-lb with eighty two mortars

opfor medium mortars

self propelled 82mm mortars

self propelled eighty two mortars

sp 82mm mortars

sp eighty two mortars

swa 60mm mortars

swa mt-lb with 82mm mortars

swa mt-lb with eighty two mortars