Keith Urban, Dierks Bentley and Montgomery Gentry were among some 1,000 motorcycle riders roaring through the desert near Las Vegas during Sunday's (May 21) Academy of Country Music motorcycle ride. This year's event, billed as a tribute to America's military, also attracted Rockie Lynne, Big & Rich's Big Kenny and Trick Pony's Ira Dean. The third annual motorcycle ride, a fundraiser for the ACM Charitable Foundation, concluded with a concert at the Fremont Street Experience in Las Vegas.