FORT HUACHUCA — A groundbreaking ceremony for a $40 million, 65,000 solar panel array, which will be the largest at any Department of Defense military installation, took place on this southern Arizona Army post Friday morning. Assistant Secretary of the Army, Katherine Hammack, said it is appropriate the event took place during the week of Earth Day, in effect making Friday a green letter day because of the fort’s special Renewable Energy Project. For Maj. Gen. Robert Ashley the electric-generating project is more than a way to save the Army money — the estimated annual electric bill for the fort...