technology commercially available

swarms of quad rotor drones carrying missiles, 

are air dropped by drone aircraft, 

quad rotor drone falls toward ground 

and starts rotors close to ground to avoid impact, 

quad rotor drone waits on ground, 

when enemy vehicles arrive, 

then quad rotor drone flies up in the air 

and fire missiles towards enemy vehicles, 

then quad rotor drone flies to new position and hides