(CNN) The military is preparing to send approximately 5,000 more active duty troops to the US-Mexico border, officials said Monday.

The new deployment, dubbed "Operation Faithful Patriot," is expected to start on November 5 and go until December 15, a US defense official said Monday. Another US official familiar with the plan cautioned that the number of troops could increase or decrease as needs are assessed.

It's a move aimed at sending a message as a migrant caravan makes its way through Mexico , drawing the ire of President Trump.

But it's important to note that even though troops are involved, the military isn't bracing for battle.

Officials emphasize that if the troops carry arms, it will be solely for self-defense. And troops are not expected to come into regular contact with migrants. They will be tasked with providing "mission-enhancing capabilities" along the southwest border, supporting US Customs and Border Protection's work there.