MERCER, Pa. (WKBN) – On Sunday, runners completed the 13th annual Memorial 100 Run, hosted by the Fallen 48 Foundation, an organization that supports mental health of veterans.

Each year, the run is hosted in a new place. This year, they started and finished in Mercer County.

“In my personal opinion, veterans are the finest citizens in this country because they volunteered to step up,” said Ben Lewis, a United States Army veteran.

That sacrifice has left many men and women in the military suffering with PTSD.

Chad Hiser served in the Marine Corps during the invasion of Iraq and then with the Coast Guard.

“You’re not emotional. That you don’t need emotion or you don’t need to be connected to emotion and so you press that stuff down and that’s what I was trying to do when I got out of the Marine Corps,” Hiser said.

Hiser suffers from PTSD, which led to a suicide attempt years ago. Veterans know his story of “invisible trauma” hits close to home.

“It’s really important to show solidarity. Solidarity with your brother and sisters in arms,” Lewis said.

There are groups that help bring veterans together to combat mental illness. The Fallen 48 foundation puts sports at the forefront and they promote veteran healing through athletics.

The organization raises money for veterans to participate in a variety of sports. Funds help purchase equipment, provide training and opportunities to attend competitions.

Many of those who ran Sunday served together.

“It’s good to see everybody and just kind of pick up right where we left off because that brotherhood never dies,” said Patrick Burgess also of the Marine Corps and United States Army.

The foundation name honors Burgess’ unit. He said they lost 48 Marines and sailors when deployed in 2005.

Memorial Day is a reminder that those lost in action aren’t the only ones we mourn — but also those who lost their personal battles on the home front.

“When someone gets lost like that, it’s not just that person that’s gone. That child’s impacted, that mother or father’s impacted. It creates a long lifelong ripple effect,” Hiser said.