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,

Given current high production levels, it isn’t clear whether reducing regulation and ending a pause on permitting for energy projects will actually boost the industry.

U.S. officials say active duty military troops are arriving in El Paso, Texas, and in San Diego on Thursday evening