The color is forbidden inside the facility, whether it's an article of clothing or even a pen, because it is the primary color of the program's rival Michigan.
But on Thursday, Ohio State University coach Ryan Day broke the strict "No Blue" rule for a great reason.
Day donned a blue shirt to honor New Hampshire head coach Sean McDonnell, who is currently battling cancer. Day played for McDonnell from 1999-2001.
While the rivalry between Ohio State and Michigan is intense, Day taking a break from the "No Blue" rule to show respect to his former coach was a classy move. Day credits McDonnell for teaching him toughness and made sure to clarify the shirt was "New Hampshire blue."
McDonnell has been New Hampshire's head coach since 1999 and owns a 154-95 record. Under McDonnell, UNH appeared in the Division IAA/FCS playoffs 14 consecutive times and won four division titles and two conference championships.