the Vietnam Veteran's Memorial created so those who are not able to travel to Washington, D.C., would be able to simulate an experience of visiting the Wall. Using personal finances, John Devitt founded Vietnam Combat Veterans, Ltd. With the help of friends, the half-size replica of the Vietnam Veterans Memorial, named The Moving Wall, was built and first put on display to the public in Tyler, Texas, in 1984. The Moving Wall visits hundreds of small towns and cities throughout the U.S., staying five or six days at each site. Local arrangements for each visit are made months in advance by veterans' organizations and other civic groups. The desire for a hometown visit of The Moving Wall was so high that the waiting list became very long. Vietnam Combat Veterans built a second structure of The Moving Wall. A third structure was added in 1989. In 2001, one of the structures was retired due to wear. By 2006, there had been more than 1,000 hometown visits of The Moving Wall. The count of people who visited The Moving Wall at each display ranges from 5,000 to more than 50,000; the total estimate of visitors is in the tens of millions. As the wall moves from town to town on interstates, it is often escorted by state troopers and up to thousands of local citizens on motorcycles. Many of these are Patriot Guard Riders, who consider escorting The Moving Wall to be a "special mission", which is coordinated on their website. As it passes towns, even when it is not planning a stop in those towns, local veterans organizations sometimes plan for local citizens to gather by the highway and across overpasses to wave flags and salute the Wall. The first Moving Wall structure to retire has been on permanent display at the Veterans Memorial Amphitheater in Pittsburg, Kansas since 2004. The Memorial is open to the public with no admission fee, 24 hours a day, year-round. Duluth, Minnesota holds the Northland Vietnam Veterans Memorial; a site that was dedicated on May 30, 1992. The Wall That Heals is a traveling three-quarter scale replica of the Vietnam Veterans Memorial started in 1996 by the Vietnam Veterans Memorial Fund. A tractor-trailer transports the wall replica and converts to a mobile Education Center at each stop, showing letters and memorabilia left at The Wall in Washington, D.C., and more details about those whose