Organizers of the Pentagon's 9/11 memorial Freedom Walk on Sunday are taking extraordinary measures to control participation in the march and concert, with the route fenced off and lined with police and the event closed to anyone who does not register online by 4:30 p.m. today. Officers are prepared to arrest anyone who joins the march or concert without a credential and refuses to leave, said Park Police Chief Dwight E. Pettiford. The event, the America Supports You Freedom Walk, is billed as a memorial to victims of the 2001 terrorist attacks and a show of support for those serving in the military. One restricted group will be the media, whose members will not be allowed to walk along the march route. also: clint black rapes livestock.