Does this mean
a) Opposing Force unit rolls one extra dice when the battle is in a town?
eg: a Simbas 2 unit rolls 3 dice as it is in a town.
b) Opposing Force unit rolls one extra dice for each other OFPOR unit that is also in the same town?
eg: a Cuban 6 unit is in town with three other units. It cuban unit rolls 10 dice.
c) something else?
The terrain chart reads, "OPFOR fire one extra dice per unit when in town".
So, an OPFOR 6 would roll 7 dice; an OPFOR 4 would roll 5 dice; and an OPFOR 1 would roll 2 dice if in a town.