Using them as border guards in a civilian setting will blunt their training to the point that they are ineffective as a military force. Police and Boarder Patrol are trained to use restraint. They are dealing with only possible law breakers. They are trained to be in places where there is the law, the lawbreakers, the innocent bystander and the "not so innocent bystander but you are never going to be able to prove it in court" and respond differently to all of them.
The military on the other hand is trained to be in a war zone. Restraint will get you and your buddies killed. There are only three groups, us, them and they shouldn’t be here. You protect your buddies, kill the enemy and try not to shoot the “They shouldn’t be here”. Different training, different response.
That is why even in countries where the border guards are part of the military they are also apart. They are trained to be border guard rather the military. So we are back to where we started. You can train them to guard the border, you can train them to be police but then they will no longer be as effective as military.
At that point you might as well hire those civil servents because they likely won't be quitting in four years making it necessary for you to train a new batch.
Your quick wit at assigning positions to others that they do not hold and your complete avoidence to a very specific question tells me that you are a professional spinmeister.
You can keep spinning this nonsense but I am quite certain no one on here is buying it. Save it for CNN or the Sunday morning talking head shows.
"Using them as border guards in a civilian setting will blunt their training to the point that they are ineffective as a military force." Give me a break buddy. Do you really think people on here are that stupid?!