The Czech Air Force (Czech: Vzdušné síly) is the air force branch of the Army of the Czech Republic. Along with the Land Forces, the Air Force is the major Czech military force. With traditions of military aviation dating back to 1918, the Czech Air Force, together with the Slovak Air Force, succeeded the Czechoslovak Air Force in 1993. On 1 July 1997, the 3rd Tactical Aviation Corps and the 4th Air Defence Corps of the Czech Army were merged to form an independent Air Force Headquarters.