Should active duty military be used to secure the borders and ensure the safety of our nation?

Absolutely... We are supposed to protect our country from enemy's both foreign and domestic.

We have LRS units, part of their mission is boarder security. If we focused their training more on that and made a few more LRS companies it would be realistic. On the other hand we have boarder patrol, let's let them do their job. As it stands no but if we thought border patrol need more help LRS units could be used.

I think this would be a great job for the National Guard. Active Duty should only roll in if stuff gets way more out of hand or if any critical threats are imminent.

Not without weapons!

Hell yes.
Part of the military goals is to defend this nation. Nothing like watching our borders.

It could be handled by the National Guard and Reserve Force on their two-week annual training a revolving schedule along with Border Patrol making the arrests to make it legal.

The guard should do it. Regular army troops would cause fear among local populace. Since regular army doesn't fit in with civilians in general. NG would be better suited and are doing it now in Texas on SAD orders. AD troops IMO would treat the area like a deployment overseas. Most NG have the army on/off switch and realize we're around our own citizens. If AD does the mission would cause more trouble then positive outcome. But that's my opinion as a Texas NG Cav scout.

there is absolutely no reason for AC Soldiers to be on the border. Since the Army Guard and Reserve are operational units they can fulfill this need. Posse Comitiatis (sp?) prevents this now and would have to be repealed.

Sounds like a job for the National Guard and should be voted on by states.

"Yes" as long as they are not constrained by ROE that puts them in danger.