old drone ideas, widespread use viable

swarms of quad tilt rotor drones with 12.7 mm guns or missiles to attack targets, 

drones rest on ground until targets are found, 

then flies and attacks targets, 

then rests on ground again, 

if possible, drones use laser to communicate with each other about critical information,

drones avoid using radio communication and prefer visual communication with each other like flocks of animals while hunting, such as seeing where other drones are, where they are going, are other drones in attack posture which means they found targets and so on, 

and drones use laser communication with satellites to communicate with command, 

drone ai detect and terminate target, without human input, 

drone ai use precision to conserve ammunition 

lots of video games have similar concepts by now