Sex sells everything from racing leathers to engine gaskets, but Harley-Davidson's new "American Bombshell" ads-- featuring a retro-riffic Marisa Miller-- draws attention to Harley's first-ever "Military Appreciation Month." ... Miller's leggy blondness makes it easy to forget that U.S. soldiers rode Harleys during the Mexican Expedition in 1916, and a special website (h-d.com/thankyou) offers 14 postcards that can be emailed to active or retired military personnel, most of which incorporate Ms.