Trump tweeted Monday that he'd alerted the military that the situation was a "National Emergy" - but the Pentagon said then that they'd received no new orders to provide troops for border security.
Those support roles include "aerial detection, maintaining and repairing vehicles, and providing logistical support so that the Border Patrol is able to get badges back on the border to enforce the law", Amstutz said.
About 2,100 National Guardsmen are already deployed to the border, following a Trump order in April.
The sprawling caravan of migrants -once estimated by the United Nations to be more than 7,000 strong - is hoping to make it to the United State. Many are fleeing violence, poverty and government corruption in their home countries.
The caravan swelled dramatically soon after crossing the Mexican border on October 19, but sickness, fear and police harassment have whittled down its numbers.
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As for Trump's long-promised border wall, one woman said border walls in general are "just wrong".
The service personnel sent by the Pentagon will be either active duty or reserve troops, Bowman adds. "We only want to give our kids a better future".
The migrants, who number in the thousands and include many women and children, are fleeing poverty and violence in Honduras and Guatemala, and are trekking through Mexico in hopes of reaching the US border. Those who clear an initial screening are often released until their cases are decided in immigration court, which can take several years. "They will not be allowed in". "And if unable to do so I will call up the U.S. Military and CLOSE OUR SOUTHERN BORDER!" That's almost double the asylum claims the USA fielded in 2015 and almost quadruple the claims in 2013.
Despite the Trump administration's claims that the migrants are trying to enter "illegally", current US law allows foreign nationals to apply for asylum at a port of entry at the border.
Three sources told CNN that the troops would not engage in lethal operations to stop the migrants, but are expected to help erect fencing and other barriers to stop the migrants.
Trump told a rally crowd in Wisconsin on Wednesday that the military was "all set". You're going to see a very secure border.