In at the Deep End | Walkthrough Homefront: The Revolution Guide

After creating the molotov cocktail, go to the nearby tunnel, to get to the red zone of Philadelphia. Go through the next corridor to get to your ally, with whom you have to prepare for an attack. After a short conversation, follow your ally to the place shown on the screenshot. Jump through the window, and wait for a convenient moment to initiate the ambush on a Korean patrol.

The moment Dana gives you the sign, destroy the hook protecting the trapdoor, and shoot the red barrels to get rid of the armored vehicle. You will have a great view on the whole combat area. Don't get downstairs until you get rid of the bigger part of the enemies.

The moment you receive new objectives, move to the place shown on your map. Due to the fact that you don't have any advanced weaponry, a good idea would be to avoid the Korean patrols and choosing roads away from them. After reaching the place, the mission will be successful and you will receive 500$.