Holding the rank of Captain, he served as commanding officer of the battlecruiser HMS Onslaught. When he and his ship were in the Minette System for a joint exercise with the local military, a coup attempt occured on the surface of Everest. Haupper deployed his ship's Marines to defend the rightful government and hold the local spaceport while the forces involved in the exercise took the rebels from the rear, ending the coup.
He later received a medal and commendation for his handling of the situation. (JIR1)