Coast Guard personnel returned fire after shots came from the Mexican side of the southern border, prompting a massive troop deployment to the region.

The troops were posted in Tamaulipas state in an area wher the rival Northeast and Gulf drug cartels are fighting for control ...

For the next 45 days, the Defense Department will test taking control a section of land east of Arizona's Fort Huachuca. The move, could allow troops to be used in ...