Welcome to the Jungle
Tosh has requested that you acquire terrazine from a group of Protoss fanatics, the Tal'darim. However, the Tal'darim have no intention of handing over the mysterious gas. You'll need to take their supplies by force.
The Tal'darim uses a heavy amount of air based units, but also makes use of some ground forces. The bulk of your army should be units that can deal with both. The marine is a good start, but you'll want to supplement your army with the mighty goliath. Set up at least two factories to start producing this vehicle and start your charge. You'll need to bring along a lone SCV to collect the terrazine, but a strong control group of goliaths and marines will be able to stop the opposition.
Outright fighting you isn't your enemy's only strategy. They can permanently seal off terrazine deposits, making the mission unwinnable. Strike at them fast, taking out their probes immediately. If need be, set up clusters of missile turrets around the terrazine to quickly destroy any enemy void rays. Once the enough canisters of terrazine are recovered, the mission will conclude. If needed, Hill will have a new goliath mercenary to hire.
