From Wikipedia: The Joint Land Attack Cruise Missile Defense Elevated Netted Sensor System, or JLENS is a tethered aerial detection system designed to track boats, ground vehicles, cruise missiles, manned and unmanned aircraft (airborne early warning and control), and other threats. The system has four primary components: two tethered aerostats which utilize a helium/air mix, armored mooring stations, sophisticated radars, and a processing station designed to communicate with anti-missile and other ground and airborne systems. Each system is referred to as an "orbit", and two orbits have been built. The Army-led joint program is designed to complement fixed-wing surveillance aircraft, saving money on crew, fuel, maintenance and other costs, and give military commanders advance warning to make decisions and provide notifications. The program was said to be "hanging by a thread" after an aerostat became detached from its mooring on 28 October 2015 and crashed hours later after floating into Pennsylvania.
Please see my JLENS Mobile Mooring Mast models for details of the complete JLENS weapons system in 1/700th scale!