See larger In the 2010 Top Wrench competition at McGhee Tyson Air National Guard Base, students compete in the Pit Crew Wheel-Changing activity. This year’s competition is Thursday, April 28, with more than 450 students participating

In the 2010 Top Wrench competition at McGhee Tyson Air National Guard Base, students compete in the Pit Crew Wheel-Changing activity. This year’s competition is Thursday, April 28, with more than 450 students participating

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