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      Where were you on 9/11?

      The cadets changed guards every hour.
      Where were you on 9/11? It's a question on so many minds this day, 12 years after the September 11, 2001 attacks that claimed more than 3,000 lives when hijacked airpliners struck the Twin Towers in New York City, the Pentagon, and a field in Pennsylvania.

      In Houghton, some remember a normal day turning to a day of shock. They watched the footage as it was streaming across the university's computers.

      "Most of us spent the day solemnly watching the computer screens, wondering what was going to happen in the world next," said Michigan Tech staff member John Lehman.

      The Michigan Tech Air Force and Army ROTC cadets organized a 12-hour guard near the university's 9/11 memorial, which bares plaques depicting the day's events and the words "A Nation United." The cadets changed guards every hour.

      "As someone going into the nation's military, I see remembering times like this as instrumental in understanding why we do what we do, our purpose, because we are here to defend the nation," said Air Force ROTC Cadet James Webber.

      Many passing by offered a flower in memory of the victims. For some, they say the anniversary is a time to move on.

      "I think it's important to remember, but at the same time not be bogged down by it. It's been 12 years and it was tragic at the time and it still is tragic, and like I said, it's important to remember, but at the same time not be bogged down by it," said Rachel Martin, a MTU Chemical Engineering Graduate Student.

      Flags around the country are flown at half-mast until the end of the day.

      You're welcome to share your 9/11 feelings and experiences in the comments below.