Members of the 10th Mountain Division, who are currently in charge of Regional Command-East, will host what will be the last official Boston Marathon Shadow Run as part of Operation Enduring Freedom.

It will be held at Bagram Air Field in Afghanistan on Friday. 

Service members and civilians are among the 600 deployed to Afghanistan to run the Boston Shadow Marathon.

The number was limited to the first 600 people who signed up.

According to the Boston Athletic Association website, since 2005, thousands of  U.S. armed forces personnel stationed overseas have participated in "shadow" versions of the Boston Marathon, running the marathon distance on, or near, Patriots' Day, whether in Iraq, Afghanistan, or on a ship at sea.

"Since we're in a combat zone, we still need to think about potential threats...For this marathon, we had to ensure that we had a well-planned out security plan," said Major Roberto Sanchez, a member of Headquarters and Headquarters Battalion, 10th Mountain Division, who's organizing the Shadow Run in Afghanistan.

The BAA has provided Boston Marathon start and finish banners, bibs, tee shirts, medals, and finisher certificates for participants in these shadow marathons.