Loot are special units that you can only get in 4 ways:

1. Some missions have a "Chance of Loot". This means that when you complete the mission, you have a chance of getting a special unit.

2. Sometimes Storm8 offer items as a reward for installing another of Storm8's Games.

3. Buying a Crate from the President.

4. Mastering all missions in a certain area to level 2