McGruber writes: The Baltimore Sun reports that a military surveillance blimp has broken free of its mooring at Aberdeen Proving Ground in Maryland and was last seen drifting at 16,000 ft over Pennsylvania. The 243-foot-long, helium-filled JLENS (Joint Land Attack Cruise Missile Defense Elevated Netted Sensor System) aerostat detached from its mooring at about 11:54 a.m. Wednesday. It was trailing approximately 6,700 feet of cable. "Anyone who sees the aerostat is advised to contact 911 immediately," spokeswoman Heather Roelker said. "People are warned to keep a safe distance from the airship and tether as contact with them may present significant danger."