Retired Col. David Molinaro, Hawaii Center for Advanced Transportation Technologies project manager, operates a mobile, 5-kW hydrogen fuel cell generator September 8, at Kalaeloa, Hawaii, during an exercise led by the 154th Medical Group, Detachment 1. The training event marks the first time a zero-emission generator used by the Hawaii Air National Guard. (Air National Guard photo by Senior Airman John Linzmeier)