The start of an operational exercise for the Army's massive, missile-tracking blimp has been delayed yet again, as ground service officials concede they don't plan to retain the system for the future force anyway. The Joint Land Attack Cruise Missile Defense Elevated Netted Sensor System, or JLENS, was set to begin an operational exercise under the auspices of U.S. Northern Command at Aberdeen Proving Ground, MD, this spring. While officials were able to launch one of the system's two tethered...