nar co-sponsors the team america rocketry challenge (tarc) with the aerospace industries association. tarc is a national rocketry competition for students in 7th through 12th grades that culminates in a national finals contest for the top 100 teams each may. while the specific challenge for tarc varies from year to year, the event always involves flying one or more raw eggs to a specified altitude and a specified flight duration, without damaging the egg.