Here’s a head-turner for a security-nervous city: A large white object was spotted in the skies above the nation’s capital in the pre-dawn hours Wednesday.Pentagon police said the Defense Department is testing a security blimp — fully equipped with surveillance cameras. The white blimp was spotted early Wednesday morning hovering at various times over the Pentagon and the U.S. Capitol. The 178-foot-long device, which is expected to remain in the skies until Thursday, is conducting a mission for the Defense Department.Full Story