AE stands for Another Earth. It was created by the Central Assembly in CC 220 and forcibly conscripts many people and appropriates technology. On the outside, the announcement of creating the AE seems to be about fighting against the Beasts, but on the inside it has been analysed to be an organisation to stop the people who are against the Central Assembly by its elite forces.
It is the primary governing body of the human race since the fall of Earth in around S.E.Y 130. The AE maintains standing armies and navies as well as the Absolute Defense line.
Planets under its authority still have the rights to their own armed forces, self governance and a say in their own system, but the collective power of the AE military outweighs that of individual planets and the AE has a higher authority than planetary officials.
Many characters belong in the Another Earth organisation.