Even if you could prove a connection between this protest and a drop in military recruiting I still don't see a crime. I may not agree with them on this but I spent most of my adult life defending their right to disagree with the administration on this issue or any other.
Like I said, it is up to the prosecutor to prove the elements of any crime charged (I gave just 2 examples above). I really don't know what use it is to keep going over and over the same stuff.