Ryan Gallagher reports:
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.
Read more on The Intercept.