Regime change. Mission creep. U.S. military intervention overseas.

For years, many of President Trump’s ardent supporters rallied around his pledge to avoid another “forever war” after the long U.S. conflicts in the Middle East and Central Asia.

Now, several prominent conservative policy advisers and commentators are raising concerns about the administration’s expanding military actions against Venezuela and in the Caribbean.

Since early September, the United States has launched a series of lethal strikes against civilian boats that American officials say are involved in drug smuggling and built up a force of more than 10,000 U.S. troops, warships and aircraft in the region.

“There’s supposed to be incentives for ending wars and conflicts around the world,” Laura Loomer, a far-right activist and influential outside adviser to Mr. Trump, said in an interview. “Yet, here we have this conflict with Venezuela that is only going to escalate.”

On a recent episode of his podcast, Stephen K. Bannon, Mr. Trump’s former chief strategist, posed the question: “Is this just a breeding ground for neocon 3.0?”

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