Kingsley Wilson, the Pentagon’s press secretary, approached the lectern on Tuesday morning. “Welcome to the Department of War,” she said.

The greeting was wholly appropriate, considering that Ms. Wilson was speaking to a briefing room of people undergoing something of an orientation program this week at the Pentagon. Most of them are media figures newly credentialed to work as journalists within the sprawling complex, agreeing to strict new rules that nearly all traditional correspondents have refused to sign.

The result has been a press corps full of people who are outspoken cheerleaders for the administration. And Ms. Wilson expressed satisfaction with the turnabout. “Legacy media chose to self-deport from this building,” she said, adding: “The American people don’t trust these propagandists because they stopped telling the truth. So we’re not going to beg these old gatekeepers to come back.”

The journalists who refused to sign onto the new rules work at news organizations such as The New York Times, The Washington Post, Fox News, national TV networks and wire services. They, as well as many media lawyers, have argued that the new rules conflict with the First Amendment.

Not long after, the chief Pentagon spokesman, Sean Parnell, announced an infusion of new voices — mostly pro-Trump commentators and outlets with limited past coverage of the military. They include Laura Loomer, the influential pro-Trump activist; LindellTV, an upstart digital news site known for promoting election conspiracy theories; and Gateway Pundit, a site that has also often spread conspiracy theories.

“We’re welcoming new media outlets that actually reach Americans, ask real questions and don’t pursue a biased agenda,” Ms. Wilson said in Tuesday’s briefing.

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