The Defense Department announced Wednesday that it is banning the sale of phones made by Chinese-based companies Huawei and ZTE on military bases worldwide over worries that the companies could hack the phones and use them to gather intelligence for the Chinese government.

Huawei and ZTE devices may pose an unacceptable risk to Department’s personnel, information and mission,” said Pentagon spokesman Major Dave Eastburn. “In light of this information, it was not prudent for the department’s exchanges to continue selling them to DOD personnel.”