Head on down there. Nobody stopping you.
Seriously though, about the only thing I would change regarding the Guard missions being carried out on the border, would be loosening of the rules of engagement, so if weapons spotted, they could freely engage. I have heard there have been incidences where they did not return fire, as not all armed with live ammunition or they needed permission to engage. I have no problem with shooting cartel drug smugglers if they resist capture or open fire. I have also heard, sometimes the armed are the cartel enforcers, while the actual drug carrying mule peasants are just dumbass migrants doing what they are told to keep from being shot by the cartels themselves. So, it is not a simple situation.