The Tre Empire was a member of the United Empire Forces. It was known for its advanced aircraft.
The Tre Empire is named after Tre. Tre was the nickname of a friend of Wes and his brother Tim during the time they were living in Naples, Italy. Before the moving shipment (containing all the toys) arrived from the United States, the kids made a large number of paper airplanes and played with those. This setting element is inspired by that.