These people are an embarrassment to our troops and our nation. Something similar to this happened during the Clinton administration, only then the armed troops had to remove their magazines and make sure there were no rounds chambered.
When Clinton came to my work place in 2000 to give a short speech about American technology, we were told in advance not to take anything that could be construed as a weapon down to where he was, so I left my Spyderco clip-on pocket knife in my desk and headed down to watch. I could have kept the knife in my pocket because no one was checking us as we walked to where he was.
There were even some incidences like this during the Korean conflict and some of our men were killed as a result of this.