StarCraft II: Wings of Liberty/Terran units

Marine
Marines can now have shields.

Reaper
The Terran Reaper is a short ranged unit equipped two pistols and a jump pack, thereby allowing them to traverse certain types of terrain. The attacks of the Reaper are much weaker than that of mechanical units like the Siege Tank; however this is advantageous against the Protoss Immortals, since the attacks do not activate their shields.

Siege Tank
The Siege Tank is a heavy mechanical ground unit with a long range and high damage capabilities. When in Siege Mode, the tank now spreads its treads in four directions while still sprouting two clamps to help keep it stationary. The Siege Mode attack has an area of effect; however the Protoss Immortals are able to reduce its damaging effects to a minimum. Mobile and stationary, siege tanks can only attack ground units.

Viking
As a replacement for the goliath and an even better tool for taking on enemies in the air. The Viking is a versatile air and ground support unit that can transform between a flying ship and a goliath-like mech that walks on the ground.