Shortly afterwards , Keselowski was called by car owner Dale Earnhardt , Jr. to drive the No. 88 United States Navy Chevrolet for JR Motorsports for the rest of the Busch Series season .
After driving for a few teams , Dale Earnhardt , Jr. called Keselowski asking him to drive his # 88 United States Navy Chevrolet for JR Motorsports for the rest of the year .