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

<i_f_v-sing>

opfor artillery battalion fire direction center

opfor artillery battery fire direction center

<line_attribute>

center

<center_operation>

center <compass_direction> of <zoomable_thing>

center <zoomable_thing>

center in on <zoomable_thing>

center on <zoomable_thing>

<normalize_pvd_operation>

center terrain at standard scale

center terrain standard scale

<specific_vehicle_type-sing>

command post carrier fire direction center

<i_f_v>

opfor artillery battalion fire direction center

opfor artillery battery fire direction center

<specific_vehicle_type-creatable-sing>

command post carrier fire direction center

<specific_vehicle_type-not_creatable-sing>

command post carrier fire direction center

<specific_vehicle_type-not_creatable>

command post carrier fire direction center