Hi okay I am stuck on the first part of mission 4 i think it is. Its the part where you have to locate the enemy warehouses and laser designate them for airstrike. I have gone in and killed all the soldiers and blown up the three trucks, but i dont know what to do next!!! please help me!!

take out your M29OICW and switch to the icon that looks like a square with a circle in it aim at the two targets on the buildings and pull the trigger

ive fired but it dousn't do anything.....HELP!!!!

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!