Video of what appears to be a column of drug mules on the US side of the border; camouflage uniforms to match the terrain, carrying heavy packs.

Select individuals on horseback armed with rifles/carbines in scabbards.

Use of horses in this type of terrain increases the guards' mobility, ability to react and gives them a height advantage for spotting problems.

Turn off the sound, just watch the video https://www.youtube.com/watch?v=F21PiHnO0JU