"We need to control the manufacture and web sale of [GPS] jammers, which is pretty unabated right now," retired U.S. Coast Guard Adm. Thad Allen testified March 29 before a joint hearing on space threats and the implications for homeland security.

The U.S. Global Positioning System can be disrupted too easily and needs better protection, experts testified during a March 29 congressional hearing on space threats and the implications for homeland security.

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Phillip Swarts joined SpaceNews as a staff writer in 2016 to cover military space.