1) Military strategy 
In nuclear strategy, a counterforce target is one that has a military value, such as a launch silo for intercontinental ballistic missiles, an airbase at which nuclear-armed bombers are stationed, a homeport for ballistic missile submarines, or a command and control installation. The intent of a counterforce strategy (i.e., attacking counterforce ...
• (n.) An opposing force.
Coun'ter·force` noun An opposing force. 
a contrary or opposing force, tendency, etc.