The U.S. Army has signed a massive contract worth up to US$4.2 billion to improve its intelligence and surveillance systems using aerostat-tethered airships. These airships, called Persistent Surveillance Systems–Tethered (PSS-T), are capable of hovering at altitudes up to 15,000 feet for extended durations. They will be fitted with advanced sensors to monitor vast areas continuously. … Continue reading U.S. Army Signs $4.2 Billion Pact For High-Altitude Surveillance Blimps That Can Even Detect Stealth Fighter Jets