Even after you shoot the soldier at the spotlight, there are still some men inside the building, so don't get too confident. Loot the bodies outside. Then climb onto the cement ledge below the building on the right.
Here you'll find some pistol ammo. Hop down off the opposite edge and follow the path leading off to the right between the two buildings.
At the end of the path, turn right. You'll find more pistol ammo and an edible plant in a little cul-de-sac.