I was in Intelligence Officer school. We were preparing for a test. One of our classmembers went downstairs to the breakroom for a few minutes.
He came back up to tell us that a plane had flown into the WTC. I asked him, “Was it foggy or something? Was it a navigation malfunction?”
Then I went downstairs to watch, just in time to see the 2nd plane fly into the other tower.
Everyone knew it was terrorism at that point.
Right after the second plane hit, I turned to the person next to me and said, “That’s it. This is war. No more criminal prosecution of terrorist acts.”