Chattanooga's darkest day sparked change in a number of ways across the state. 

Now, more people are trained in what to do if they're in an active shooter situation and members of our military are better protected on Tennessee soil. 

The state's top homeland security officials tell Channel 3 terror attack protocol worked fairly well that day. 

"In the first minutes of the incident, it became clear to us that it might be a case of domestic terrorism," David Purkey, Assistant Commissioner of Department of Safety and Homeland Security said, "One of the things the governor and I talked about was implementing terrorist protocols and he instructed me to implement those protocols and also provide any available assistance to Chattanooga."

The attacks sparked change in a variety of ways. 

Purkey says his office was flooded with requests for more training in active shooter awareness after July 16th, 2015. 

In the last year, the state has trained 35,000 people in the public and private sectors on how to respond to an active shooter. 

"We continue to honor all requests to provide that training free and on the group's time and place that they want to do it, we'll come and do it," he added. 

But perhaps the biggest change can be seen at Tennessee's military installations where military personnel can now carry weapons, a move spearheaded by Tennessee Governor Bill Haslam. 

"We literally had a legislative change and a policy change. Then we also at our own national guard facilities, beefed up the security because we realized of all people, we don't want these men and women being targets," Haslam said.

"Everything we do now is dedicated to what happened in Chattanooga, dedicated to the four Marines and one Navy sailor who lost their life that day. There's not a day that goes by that we don't discuss that incident and it's the reason we do everything that we're doing now," Purkey added.