Four military police units from Texas are among as many as 1,500 active-duty troops bound for the nation’s southern border to “bolster security,” military leaders said Friday.

The Defense Department has begun to repatriate illegal immigrants, using military cargo aircraft as the Trump administration steps up its crackdown at the southern border. The first such military flight out of El Paso,

As active-duty U.S. soldiers began moving toward the nation's southern border to confront what President Donald Trump called "a national emergency," much is still unclear about their mission, including whether they would be armed,