John, the guy with the back pack, was the second person I gave one of my dog tags to. His mother was diagnosed with breast cancer in 1997. He had hoped to walk before she passed but didn't have the chance to. After retiring from the Marines he started walking. He missed the walks in 2006 because he was finishing rehab from his seventh surgery. In 2007 he walked all 9 Avon Walks and is doing them all again this year.
There are several teams who walk not just every year but at multiple locations each year. He said it was like a reunion at each one and they get the added bonus of seeing beautiful cities in a way they never would be able to other wise. These are dedicated walkers who truly hope to leave breast cancer behind them in a trail of dust.