In the Soviet system decisions were made to protect the government from its own soldiers. In many countries there is only one airforce, the Soviet Union had five airforces. Two of these airforces were the main users of Soviet fighter airplanes. One airforce was called "PVO Strany", this airforce was used to defend the cities and land of the Soviet Union. One airforce was called "Frontal Aviation", this airforce was used to defend the Soviet Union's ground soldiers against enemy fighter airplanes, and to attack enemy ground forces. Mikoyan-Gurevich became the main designer of aircraft for "Frontal Aviation".