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Merrell Down & Dirty returned to Philly for the fifth consecutive year with a new 21 obstacle military style course at a new location and with a new cause.

This year’s race has partnered with Operation Gratitude who’s mission is to lift the morale of service men and women deployed to hostile territories around the world by sending personalized care packages containing food, hygiene products, entertainment items and letters of appreciation. Over $200,000 has been raised for the organization so far thanks to MESP and the Merrell Down & Dirty Obstacle Race presented by Subaru.

Mud Run Archives:

PHOTOS: 2014 Dirty Girl Mud Run

RAW VIDEO: 2014 Dirty Girl Mud Run

PHOTOS: 2013 Merrell Down & Dirty Mud Run

PHOTOS: 2013 Filthy Fun Run

PHOTOS: 2012 Filthy Fun Run

PHOTOS: Tough Mudder PA 2012

PHOTOS: Ultimate Mud Run Night Ops 2012

PHOTOS: Muck Ruckus Philly 2012