1 0 0Best done while you are on the "Recovery" level.Once you get the checkpoint and the objective to "Infiltrate the school and locate the hostage". There will be a precision rifle close by.Pick it up and scope up the turret on the beach. Kill the guy that is manning the turret. Now you must wait! Eventually one of his friends will come to check out what's going on. Pop him in the head too. Rinse and repeat as 3 more guys will come investigate eventually. This may take a minute or two. These dudes were hitting the crack pipe and can't function very swiftly.Trophy will unlock as soon as the 5th guy eats a bullet.