6500 XP, Auto Rifle
After completing the Welcome to the Jungle quest, talk to Matutero to begin this quest. Head to Ghost Town until you trigger a cutscene. This will trigger a new enemy called a butcher, who is fast and tough. Use something powerful against him.
Once you get to Afran's soldiers, kill them all. They will fight any zombies that attack so let them kill each other if you're running low on health or ammo. Once you clear the area load the weapon boxes into the truck that is on the other side of the river and bring them back to Matutero. Set the boxes on the crate marked outside and talk to Matutero for your reward and to start the quest Soldier of Fortune.