noun which may take the genitive case particle 'no'
surface-to-air
Used in military and technical contexts to describe weapons or systems launched from the ground to target aircraft or missiles.
地対空ミサイルが敵機を迎撃した。
The surface-to-air missile intercepted the enemy aircraft.
空対空 means 'air-to-air', used for missiles fired from aircraft at other aircraft.
Compound of 地 (ground) + 対 (against) + 空 (sky), literally 'ground versus sky'.