Captain Ericka Johnson, a Legal Service Support Section defense attorney, conducts egress training at the Quantico Reserve Support Unit High Mobility-Multipurpose Wheeled Vehicle (HUMMWV) Egress Assistance Trainer (HEAT) Nov. 20 to practice rollover training. The repetitive training exercise duplicates the effort required to exit an inverted vehicle. - Captain Ericka Johnson, a Legal Service Support Section defense attorney, conducts egress training at the Quantico Reserve Support Unit High Mobility-Multipurpose Wheeled Vehicle (HUMMWV) Egress Assistance Trainer (HEAT) Nov. 20 to practice rollover training. The repetitive training exercise duplicates the effort required to exit an inverted vehicle.