Onboard the Valkyrie:

Exit the boat and go up the stairs to help your allies clear the initial room of hostiles.

Use the nearby weapon box if needed.

Once the room is clear, follow Kovic to the bridge.

Open the door and go up the stairs.

Continue down the hall and climb the next set of stairs.

Once outside, enemy choppers will attack. Head inside the room past the stairs to find a gadget stash.

Grab a stinger (a type of weapon) and use it to take down the enemy chopper.

Follow the squad towards the hangar.

In the next room, use grenades and the visor (a tool to see enemies) to locate and deal with enemies amidst the vehicles.

Stay with your squad; rushing ahead will make you an easier target.

When the hangar is clear, open the door and climb the stairs.

A woman will join you in fighting soldiers after you see her through the windows.

Once outside again, fight alongside your allies against a large number of hostiles. Use the visor and stay close to the squad. Use the engage command as well.

After the fight, Kovic will need help removing an obstacle to clear a ladder.

An incoming chopper will kill Kovic and deploy enemy troops. Use your stinger or RPG (Rocket Propelled Grenade) to take it down, though it may go down after deploying its troops.

Three more choppers will deploy troops soon after.

After the choppers are down, you will witness Kovic's final moments.

Irish will hand you the intel, and you can climb the ladder.

Head up to the bridge and eliminate the final two enemy soldiers.

Captain Garrison will emerge, marking the end of the mission.