I was working at the support warehouse for the Army National Guard in my state and heard the first hit announced on the radio. We stopped inventorying equipment to gather around the computer terminal and the radio.
When the second plane went in I turned to my friends and said that we were going to war against somebody, a feeling that we all agreed on when we heard about the strike on the Pentagon.
We took turn ins and issued gear to units thoughout the day, and all talk centered around speculating who might have been responsible.
I drove 115 miles that evening to see my kids.
Watching the video of the hits on the towers, my young son (who probably didn't realize it wasn't something out of a movie) laughed and said "That was cool..."
I quietly told him that he had just watched a couple of thousand people in those buildings die, and that they were regular folks just like his Mom and Dad with families of their own. My daughter already knew this...but watching it hit him was painful.
My kids asked about what we would do to the people who attacked us, and we talked way into the night, far past my regular visitation times, but my ex-wife understood and sat in with us. They were worried about me being in the military and had lots of questions and fears.
I lost friends in both cities. I have lost friends since then overseas. I might forget that day once I'm dead, but I doubt it.