Not just the DoD -- pretty much the entire intelligence community, in every developed country. Also, several private companies with high-stakes IP; I know this

Not just the DoD -- pretty much the entire intelligence community, in every developed country. Also, several private companies with high-stakes IP; I know this is the case at some quantitative trading firms, for instance, and I knew some people working in Prime Air at Amazon in the early days who not only had to surrender their phones, but had to arrive at the office (whose address was unpublished even internally) by way of unmarked bus from a park-and-ride (and weren't allowed to wear anything which would identify them as working for Amazon).