Offensive counter air

Offensive counter-air (OCA) is a military term for the suppression of an enemy's military air power, primarily through ground attacks targeting enemy air bases: disabling or destroying parked aircraft, runways, fuel facilities, hangars, air traffic control facilities and other aviation infrastructure. Ground munitions like bombs are typically less expensive than more sophisticated air-to-air munitions, and a single ground munition can destroy or disable multiple aircraft in a very short time whereas aircraft already flying must typically be shot down one at a time. Enemy aircraft already flying also represent an imminent threat as they can usually fire back, and therefore destroying them before they can take off minimizes the risk to friendly aircraft. Air-to-air operations conducted by fighter aircraft with the objective of clearing an airspace of enemy fighters known as combat air patrols can also be offensive counter-air missions, but they are seen as a comparatively slow and expensive way of achieving the final objective - air superiority. The opposite term is defensive counter air, primarily referring to the protection of territory, men and/or materiel against incursion by enemy aircraft, usually with a combination of ground-based surface-to-air missiles and anti-aircraft artillery but also through defensive combat air patrols. Offensive counter-air strikes have been used since World War I. The Teishin Shudan and Giretsu Kuteitai carried out two OCA raids in the Pacific theatre against B29s. In one measure the most successful single OCA mission to date was Operation Focus, the Israeli offensive that opened the Six-Day War of 1967, when the Heyl Ha'avir destroyed a large portion of the air power of Egypt, Syria, and Jordan, mostly on the ground, totaling roughly 600 airframes destroyed by a force of 200 aircraft. However, in sheer number of planes destroyed, the opening two weeks of Operation Barbarossa saw some 3-4,000 Russian planes destroyed in total.