It's the end of day two and police officers from around the state and as far away as Tennessee are learning about impact munitions.
Sergeant Rusty Jacks with the Tyler S.W.A.T. team explains.
"We use those for situations where we have a suspect who's a threat, but not necessarily a deadly force threat."
Another group is working with flash-bangs, devices officers use to create a non-violent distraction when they're serving dangerous search warrants.
These are just two of the classes the officers will complete during the 60 hours of training.
For those who are already on S.W.A.T. teams, it's just an extension of skills they already have.
For others, like Diana Massey, it's part of a job interview. She's one of three Tyler police officers applying for the S.W.A.T. team, and she's the only woman in the class.
"It's something I really want. I've wanted it for a long time. So, you just got to put that aside, and you learn, or you don't," says Massey.
"This gives us a chance to evaluate their capabilities, and them a chance to decide if they really want to continue with being a S.W.A.T. officer," say Jacks.
Up until the early 90's, this type of specialized training was expensive and hard to come by. Now, thanks to organizations like the Texas Tactical Police Officers' Association, it's more widely available.
So, officers from Abilene, Texas to Milan, Tennessee can apply what they've learned and protect their communities.