Keep heading towards your current destination. You won't encounter any new units for the time being, although one of the enemy soldiers will be hiding just around the corner (screen). Kill him quickly and keep moving forward. The area should be safe by now, so you may go ahead and speed up a little.
You should be getting closer to your main objective. There's an entrance leading to a bunker here. It's being guarded by an allied soldier. Listen to what he has to say to you. After that, start following him. You will have to reach a platform in order to get to the upper level of the bunker. Save your game there.
This is going to be the final part of this mission. Go ahead and use a nearby heavy machine gun post. You can do this by pressing and holding the X key. Start shooting at the enemy soldiers. Make sure that no one gets closer to the bunker. You will also have to use your powers. I'd strongly recommend using a slow-motion feature, so you won't deplete the power bar too soon.
Your main objective during this sequence will be to find and eliminate enemies equipped with rocket launchers. If you suffer any injuries, leave the machine gun post and hide to your right (screen). It's very important, because you'll be safe there. You must wait for the Sentry to get here.
One of the officers will suggest to leave this area in order to avoid being spotted by the Sentry. Follow these instructions. As a result, you must use the platform to go back to the lower level of the bunker. Wait for one of the allied soldiers to move a large grating for you (screen). Use the ladder. This will allow you to end this mission. Get ready for the next one.