AMSOIL-lubed Challenge America Siverado Brings Recognition for Wounded Vets. One of the highlights of the SEMA Show, featured prominently in the GM booth, was Nic Ashby's Challenge America Chevrolet Silverado. In a post script to the show, the Victorious Project blog stated, "We’re all on Cloud 9 because SEMA was a huge success for Challenge America in promoting the needs of our veterans."