Don't know if captain of the football team is considered an officer of a student organization, but I'm gonna bet it has something to do with this clause in du Lac...
Eligibility for Student Activities (revised October 31, 2011)
Satisfactory academic and disciplinary standing is required in order to be eligible for student body office, class office, hall office or membership in the Campus Life Council, Hall President’s Council, Student Government, Club Coordination Council, or any judicial board. The same requirement applies to cheerleaders, officers of campus clubs, organizations or activities. Participation by students as members or leaders in extra-currciular clubs, programs, and activities could be limited in whole or in part if the student is found responsible for a violation of the University Standards of Conduct.