For most , it was probably their first encounter with an OCR ( obstacle course race ) .
On Saturday , March 23 , 2013 , over 220 people became a part of the first ever Dirty Bird Nation .
For most , it was probably people 's first encounter with an OCR ( obstacle course race ) .
On Saturday , March 23 , 2013 , over 220 people became a part of the first ever Dirty Bird Nation .