Military or Civilian Venue for Terrorist Trials?

According to The Austin American Statesmen, the Obama administration favors a civilian trial for the 9/11 mastermind Khalid Sheikh Mohammed and four other suspects. These prisoners have been held at Guantanamo Bay, a military prison. I find it interesting that these prisoners are quartered in a military prison, but are being considered for a civilian court hearing. I believe that any attack on our national security should be handled by our military. In my opinion, our civilian court system was designed to handle public issues between individuals and private or public property. Our military government on the other hand, should handle issues pertaining to federal property, peoples, and overall well being of our nation. I believe that the terrorist attack of 9/11 put our national safety at risk and the prisoners should be tried at a military venue.