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To residents of Maryland, catching an occasional glimpse of a huge white blimp floating in the sky is not unusual. For more than a decade, the military has used the state as a proving ground for new airships destined for Afghanistan or Iraq. But less known is that the test flights have sometimes served a more secretive purpose involving National Security Agency surveillance.

Back in 2004, a division of the NSA called the National Tactical Integration Office fitted a 62-foot diameter airship called the Hover Hammer with an eavesdropping device, according to a classified document published Monday by The Intercept. The agency launched the three-engine airship at an airfield near Solomons Island, Maryland. And from there, the blimp was able to vacuum up international shipping data emanating from the Long Island, New York area, the document says. The spy equipment on the airship was called Digital Receiver Technology a proprietary system manufactured by a Maryland-based company of the same name which can intercept wireless communications, including cellphone calls.

With the exception of a few military websites that refer to the Hover Hammer as an antenna mounting platform, there is little information in the public domain about it. The classified NSA document describes the airship as a helium-filled sphere inside another sphere, constructed of Spectra, the same material used to make bullet-proof vests. It hovers above small arms fire, has a negligible [infrared] signature, and radar cant detect it. The agency added in the document that it planned to conduct more tests with the Hover Hammer, and said it wanted to develop a larger version of the blimp that would be capable of flying at altitudes of 68,000 feet for up to six months at a time. More experiments, including the use of onboard imagery sensors, are being conducted, it said.

The NSA declined to comment for this story.

In recent years, airships or aerostats, as they are formally called have been a source of major military investment. Between 2006 and 2015, the U.S. Army paid Raytheon some $1.8 billion to develop a massive missile-defense blimp called the JLENS, which is equipped with powerful radar that can scan in any direction 310 miles. (Thats almost the entire length of New York state.) In October 2015, the JLENS attracted national attention after one became untethered amid testing and drifted north from Maryland to Pennsylvania before it was brought back under control. In 2010, the Army commissioned another three airships called Long Endurance Multi-Intelligence Vehicles as part of a $517 million contract with Northrop Grumman. The company stated that the airships would shape the future of the militarys intelligence-gathering capabilities and provide a persistent unblinking stare from the sky.

Unsurprisingly, privacy groups have expressed concerns about the prospect of the blimps being used domestically to spy on Americans. However, military officials have often been quick to dismiss such fears. In August 2015, Lt. Shane Glass told Baltimore broadcaster WBAL that the JLENS blimps being tested in Maryland were not equipped with cameras or eavesdropping devices. There are no cameras on the system, and we are not capable of tracking any individuals, Glass stated. The same cannot be said, it seems, of the NSAs Hover Hammer.

Top photo: A flight crew launches a U.S. Army Joint Land Attack Cruise Missile Defense Elevated Sensor System (JLENS) at the Utah Test and Training Range, Utah, on Feb. 3, 2014.

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NSA Blimp Spied in the United States - The Intercept - The Intercept