Ghosts can request Irradiate attacks from overhead Science Vessels by using the Irradiate channel of the C-20A's targeting system. When in Sniper Mode, highlight a target by centering it in view. Press the L-Trigger to initiate coordinate information upload. When upload is complete, press R-Trigger to initiate the attack and close the channel. Irradiate saturates the target with a damaging stream of radioactive particles. Units within close proximity to the target are also affected by the attack.