Here are all the known brigades (elite)
Solar Brigade
1. They are Celestias personal soldiers
2. They typically deal in anti-terror
3. They are the most disciplined ponies in the world
4. They can be used as a military force
5. Their skills typically are honed toward anti magic and aoe attacks
Dawn Brigade
1. They are Twilights personal soldiers
2. They typically deal with research and development
3. They typically are sent in on mentions with many unknown factors
4. They are not very disciplined and are not require to be either
5. They can be used as a military force
6. Their skills are very magically orientated and also have access to the latest gear
The Lunar Brigade
1. Luna
2. Spies
3. Night missions
4. Discipline varies
5. Used as military
6. They specialize in assassination