Eta by T.J Barlet

A new Earth, born out of conflict, faces an unforeseen challenge. While those that are still trying to find themselves fight to save it, and each other. In the 22nd century, four of the Senior Cadets of the newly formed United Republic of Earth (URE) aerospace academy find what little they know of the World turned upside-down. Their journey of survival takes them to places they never imagined, uses all of their skills, and shows them things they never knew or even thought possible. Not only about their World, but about themselves.