Combat Squads
(Rule)Description: A number of ten-man units in the Space Marines army have the option of breaking down into two five-man units, called combat squads. The decision to split the unit into combat squads, as well as which models go into each combat squad, must be made when the unit is deployed. Both combat squads can be deployed in separate locations. The one exception to this is a unit that arrives by Drop Pod. The player can choose to split such a unit into combat squads when it disembarks from the Drop Pod.
If you decide to split the unit into combat squads, then each combat squad is treated as a separate unit for all game purposes from that point.