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Yes, they are: "Officials from the Department of Homeland Security and Department of Defense announced Monday 5200 additional active duty U.S. troops will be deployed to the southern border with Mexico by Friday. Eight-hundred soldiers are on their way to Texas now.

“They are in fact deploying with weapons," U.S. Northern Command Air Force General Terrence O'Shaughnessy said during a press conference. "I think the President has made it clear that border security is national security."

Troops are being sent to bolster border security in Arizona, New Mexico and Texas as at least three caravans from Central America make their way through Mexico and toward the United States. The caravans pose a special threat due to their size, which range from 3,000 people to more than 10,000. According to U.S. Customs and Border Protection Commissioner Kevin McAleenan, at least one caravan near Guatamala, Mexico has used violent tactics to breach a number of international borders."

from another article... just posted... they are armed.