Colorado Springs - The military is relegating its newly renovated airspace and missile defense complex in Cheyenne Mountain to standby status - clouding the future of a Cold War nerve center touted as the most secure spot in America. The green-jumpsuited sentries who electronically scan the skies from deep inside this granite cocoon southwest of Colorado Springs - built in the 1960s to withstand Soviet nuclear blasts - now are to blend into broader homeland defense operations under prairie skies at nearby Peterson Air Force Base. "I can't be in two places at one time," said Adm. Tim Keating, commander...