16 years ago, terrorists flew two planes into the twin towers of the World Trade Center in New York City, a third plane hit the Pentagon, and a fourth plane crashed in a field in Pennsylvania - killing nearly 3,000 people.
Students from the Douglas School District honored the victims and heroes of 9/11 with a Freedom Walk on Monday.
Thousands of students and faculty walked around the Douglas football stadium in patriotic colors.
Chief Adam Vizi says history is an important part of our country, and it's important that we never let our youth forget what happened on this day in 2001.
Ellsworth Air Force Base 28th Bomb Wing Command Chief Adam Vizi says, "Just knowing the historical things that happened in our country 17 years ago, 16 years ago on 9/11, September 11, 2001. It's important for our children, our youth, to understand why we recite certain things. The Pledge of Allegiance for instance or our National Anthem or why America is the greatest country in the world."
After the walk, everyone listened to a speech from Chief Vizi and sang "God Bless the U.S.A."