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 (attacking counterforce targets with nuclear weapons) is to do a pre-emptive nuclear strike whose aim is to disarm an adversary by destroying its nuclear weapons before they can be launched. That would minimize the impact of a retaliatory second strike. However, counterforce attacks are possible in a second strike as well, especially with weapons like UGM-133 Trident II[clarification needed]. A counterforce target is distinguished from a countervalue target, which includes an adversary's population, knowledge, economic, or political resources. In other words, a counterforce strike is against an adversary's military, and a countervalue strike is against an adversary's cities.
A closely related tactic is the decapitation strike, which destroys an enemy's nuclear command and control facilities and similarly has a goal to eliminate or reduce the enemy's ability to launch a second strike.
In nuclear warfare, enemy targets are divided into two types: counterforce and countervalue. A counterforce target is an element of the military infrastructure, usually either specific weapons or the bases that support them. A counterforce strike is an attack that targets those elements but leaving the civilian infrastructure, the countervalue targets, as undamaged as possible. Countervalue refers to the targeting of an opponent's cities and civilian populations.
An ideal counterforce attack would kill no civilians. Military attacks are prone to causing collateral damage, especially when nuclear weapons are employed. In nuclear terms, many military targets are located near civilian centers, and a major counterforce strike that uses even relatively small nuclear warheads against a nation would certainly inflict many civilian casualties. Also, the requirement to use ground burst strikes to destroy hardened targets would produce far more fallout than the air bursts used to strike countervalue targets, which introduces the possibility that a counterforce strike would cause more civilian casualties over the medium term than a countervalue strike.
Counterforce weapons may be seen to provide more credible deterrence in future conflict by providing options for leaders. One option considered by the Soviet Union in the 1970s was basing missiles in orbit.
Counterforce is a type of attack which was originally proposed during the Cold War.
Because of the low accuracy (circular error probable) of early generation intercontinental ballistic missiles (and especially submarine-launched ballistic missiles), counterforce strikes were initially possible only against very large, undefended targets like bomber airfields and naval bases. Later-generation missiles, with much-improved accuracy, made possible counterforce attacks against the opponent's hardened military facilities, like missile silos and command and control centers.
Both sides in the Cold War took steps to protect at least some of their nuclear forces from counterforce attacks. At one point, the US kept B-52 Stratofortress bombers permanently in flight so that they would remain operational after any counterforce strike. Other bombers were kept ready for launch on short notice, allowing them to escape their bases before intercontinental ballistic missiles, launched from land, could destroy them. The deployment of nuclear weapons on ballistic missile submarines changed the equation considerably, as submarines launching from positions off the coast would likely destroy airfields before bombers could launch, which would reduce their ability to survive an attack. Submarines themselves, however, are largely immune from counterforce strikes unless they are moored at their naval bases, and both sides fielded many such weapons during the Cold War.
A counterforce exchange was one scenario mooted for a possible limited nuclear war. The concept was that one side might launch a counterforce strike against the other; the victim would recognize the limited nature of the attack and respond in kind. That would leave the military capability of both sides largely destroyed. The war might then come to an end because both sides would recognize that any further action would lead to attacks on the civilian population from the remaining nuclear forces, a countervalue strike.
Critics of that idea claimed that since even a counterforce strike would kill millions of civilians since some strategic military facilities like bomber airbases were often located near large cities. That would make it unlikely that escalation to a full-scale countervalue war could be prevented.
MIRVed land-based ICBMs are considered destabilizing because they tend to put a premium on striking first. For example, suppose that each side has 100 missiles, with 5 warheads each, and each side has a 95 percent chance of neutralizing the opponent's missiles in their silos by firing 2 warheads at each silo. In that case, the side that strikes first can reduce the enemy ICBM force from 100 missiles to about 5 by firing 40 missiles with 200 warheads and keeping the remaining 60 missiles in reserve. For such an attack to be successful, the warheads would have to strike their targets before the enemy launched a counterattack (see second strike and launch on warning). This type of weapon was therefore banned under the START II agreement.