This Seems Such A Good Idea,

using a blimp and give it a radar system,

 named the Joint Land Attack Cruise Missile Defense Elevated Netted Sensor System, (JLENS), the testing included an endurance test in which JLENS was airborne for 20 days, though the production version should be able to stay aloft for 30 days,

soldiers also tested the control system and completed six weeks of early testing with about 100 soldiers on June 14, the system will use two 243-foot-long blimps, floating in the air as high as 10,000 feet, the blimps can detect threats as far away as 340 miles, JLENS is meant to protect the Washington, DC area from attack,

but what is not supposed to happen this, a free floating blimp out of control over rural Pennsylvania caused by someone forgetting to put batteries in the last of a number of failsafe systems, I guess the makers Raytheon should have put a sticker on it, 'batteries not included!' still it could have been worse, the blimp took 17 years and $2.7 billion to build it, so shooting it down was not really an option as two F 16 fighter jets were scrambled, but all is well now, the incident happened some time ago, but it was only yesterday that information into the cause of the fly away blimp was released.