App developers expressed surprise, and in at least one case disbelief, when told access to their location data was being purchased by the Defense Department and military contractors.

A review by Vice’s Motherboard found that the U.S. military taps into two data streams via a pair of companies, including one called Locate X and another called X-Mode, which sells data to contractors, including data from a Craigslist app, an app for following storms, and several apps focused on Muslim lifestyles and customs.