The viral video shows Polish tanks during a military parade in the country’s capital, and it predates President Trump’s second term.

The president has directed the U.S. military to reinforce the border, and the acting secretary of defense on Wednesday announced the Pentagon is sending around 1,500 active duty troops to the country’s southern border, joining 2,500 active duty personnel already there.

Some 1,500 U.S. troops have been ordered to the U.S. southern border by President Donald Trump. Here's a glimpse into some of the duties they'll be tasked with when they arrive.

The Pentagon’s Transportation Command will use military aircraft to send more than 5,000 undocumented immigrants from San Diego and El Paso, Texas, who are detained by Customs and Border Protection, Acting Defense Secretary Robert Salesses said in a statement. The troops also will assist in building new border fences and barriers.

A U.S. Border Patrol agent who was killed in Vermont during a traffic stop near the Canadian border was a military veteran who worked security duty at the Pentagon during the Sept. 11 attacks, his family said.

The Pentagon said Wednesday it has begun deploying 1,500 active duty troops to help secure the southern border, putting in motion plans President Donald Trump laid out in executive orders shortly after he took office to crack down on immigration.

The Pentagon should change its Basic Allowance for Housing methodology to better insulate troops against swift changes to the housing market and better reflect the types of residences in which they choose to live.

This is just the beginning,” one Defense official said about the deployment of active-duty troops to the border with Mexico.

The deployment signals the military’s increased role in a much more aggressive immigration policy under the second Trump administration.

The move enacts President Trump's executive orders issued shortly after he took office to intensify immigration enforcement.

WASHINGTON — The Pentagon will begin deploying as many as ... where migrants are waiting to be processed, in Del Rio, Texas, on Sept. 18, 2021. REUTERS The active duty forces would join the ...