Tangled up in Blue

Head to the Porto Cavo airbase and take out the ground units to protect the rebel plane until it takes off. You only have to deal with basic foot soldiers so just keep killing them until the rebel plane is able to take off. Once done, you can pilot one of the parked planes in the runway and use it to reach the next battlefield.

Next, you have to destroy a convoy which includes a bavarium tank. You can hijack the tank when the shields are down then use it to destroy the rest of the convoy. Once cleared, place some explosives on the tank to destroy it.

Convoy Destruction

Finally, you have to head to the Centcom and enter through the water gate. Destroy the first generator there then swim through a long, underwater tunnel. Make sure to take a breather through the air pocket on the ceiling. Make your way to the facility and start working on destroying the generators. These generators are hidden behind solid blast doors so you have to activate the nearby buttons to open the gates and reveal the generators inside.