DUMFRIES, Va. (WUSA9) -- More than 2000 runners participated in the Marine Corps 17.75k in Prince William County.

About 150 of them came in support of fallen Officer Ashely Guindon who was killed on her fist day on the job.

RELATED: Police participate in Marine Corps run to honor fallen officer

Guindon's coworkers ran with purpose wearing t-shirts in honor of their fallen comrade who was killed in the line of duty, just a day after she was sworn in.

"I've always wanted to run this race and what better reason to run than to honor Ashley and her sacrifice," said Major Thompson, Prince William County Police.

"I was Ashley's instructor when she went through the academy. I was her squad leader. It hit the entire department, every single one of us. She's been on our minds every single day since," said Officer Jason Van Horn.

Ashley and two other officers were responding to a domestic call in Woodbridge. Army Staff Sgt. Ronald Hamilton,32, is accused of shooting and killing his wife Crystal before opening fire on the officers. Officer Jesse Hempen and David McKeown were injured but survived.

RELATED: Va. officer killed day after being sworn in

The 17.75k was a tough 11 mile run through Prince William Forest Park.

Ashley's family traveled from Massachusetts and New Hampshire to be there. Some of them participated in the run, others did not but they were all touched by the support.

"The love and the outpouring from the community has been great. The Prince William County Police Department has been outstanding," said Mark Guindon, Ashley's Uncle.

Ashley's uncle said their family comes from a long line of police and military backgrounds. Ashley's father served in Iraq. She was a Marine reservist.

The Marine Corps 17.75k race celebrates the year the Marine Corps was established.