National Guard Panther Racing driver JR Hildebrand, the 2011 Indianapolis 500 Rookie of the Year, burst onto the open-wheel scene last season after a dramatic runner-up finished in the 100th Anniversary of the Greatest Spectacle in Racing. The 24-year-old Californian returns to drive Panther's No. 4 National Guard Chevrolet in 2012 after a promising rookie campaign.