After the opening cutscene, you'll be given brief control of Snake. Crawl under the truck parked by the low wall to get a Ration then crawl under the other truck to trigger another cutscene. After that, pick up the AK-102 and the other dropped rifles to obtain some Ammo, then either go back up the road you just came down, or go up the NW road, it doesn't matter which, once you get to the end of either road, another cutscene takes place.
The cutscene introduces you to a new enemy: Gekko.The means to take out this enemy are not at your disposal, so run! Head into the building with the missing wall to the SW to get out of the street, and move from cover to cover to avoid the Gekko. If you are spotted however, don't worry about an Alert going off, it won't. Go North to the blip on your radar to trigger yet another cutscene.
After all the cutscenes are done shake down(pick up and then put back down)the bodies of the dead Militiamen to obtain Items and Ammo, then head through the alleyway. In between two buildings across from you are Petrol Bombs, cross the street and grab them. A PMC Stryker will arrive to drop off a squad of PMC Soldiers and gun down a small group of Militiamen. Cross the street and go through the doorway and collect the items inside. You can shake down the trio of Militiamen in the small room if you want, but be careful so that the PMC Soldiers don't see you.
Crawl under the pile of rubble to see a Militiaman get gunned down by a PMC Soldier after begging for his life. Wait until the PMC Soldier moves away then sneak up behind him to hold him up, grab him and slit his throat, or just throw him to the ground to get rid of him. Move through the building and open the lockers to obtain a Regain, then move to the doorway and wait for the pair of PMC Soldiers to move down the street before moving across and into the next area.
In the next area go underneath the stairs to obtain a Cardboard Box then head up the stairs and Dive-Roll over the gap to get into the small room. A single PMC Soldier is here, so, wait for him to turn his back and dispatch him, then head down the next flight of stairs and search the lockers for Items and move through the doorway. Watch the PMC Soldiers' patrol route and when he turns his back, either sneak up and take him out, or sneak by him and climb the ladder and crawl on the floor to get around him. When you're near the blip on your radar, hide behind the dumpster until a pair of PMC Soldiers move through the area and move away. Once they're gone, enter the building to trigger another cutscene and get some new toys.