By David Sanger, a White House and national security correspondent, and Julian Barnes, a national security reporter.

The Biden administration would like you to get a vaccine and wear a mask. Oh, and one more thing: It has just proclaimed that it’s time for government employees and contractors to get off public Wi-Fi, where they can pick up another kind of virus.

In a warning to all federal employees, leading defense contractors and the 3.4 million uniformed, civilian and reserve personnel . . .