He's walking for those often forgotten: homeless veterans.
"There are parts of LA that you would swear are a refugee camp,” Gmur said.
A California native, Gmur's trek is taking him from Portland, Maine to San Diego. Monday, he made his way from Lone Jack, Missouri to Overland Park, Kansas. Around Manhattan, he’ll reach the halfway point.
The goal is raising both money and awareness for homeless veterans. His GoFundMe is just over $4,000 so far
"It's already a success to be completely honest,” he said. “The fact that I've raised any money and the fact that people are interested and want to help."
He had to switch from a pack to cart about 250 miles in.
"I just kept getting blood blister after blood blister after blood blister,” he said.
A shoe company donated four pairs of hiking boots. He’s on No. 2, averaging around 35 miles and two near-deaths from vehicles every day.
"Worth every ounce of pain that my body goes through,” Gmur said.
His brothers are veterans who were nearly homeless themselves. He served 4 1/2 years in the Marines and decided to begin his march on June 8, the anniversary of the day his brother died.
"I think a lot of it is adjustment coming back,” Gmur said of the issues veterans face. “They're working on programs to help with that transition but they're not good enough."
On bad days, good people he meets along the way keep him going.
"It just lifts my spirits and makes me want to keep pushing,” he said.
Monday, he ran into a family filled with Army veterans.
“Even if you’re not in the same branch of service, you all have similar struggles and understand what’s it’s like,” Gmur said.
Kindness, generosity and donations keep him going and they’re key to the message he’s trying to spread.
"When you see homeless people,” Gmur said. “Remember that they're people.”