Vietnam Veterans Traveling Wall That Heals Memorial in Loleta, California... I heard a flock of Motorcycles Drive by my house, then followed them to the exhibit.

The Bikers were escorting this Traveling Wall That Heals all around the country... 

http://www.vvmf.org/twth

The Wall That Heals: Mobile Exhibit. On Veterans Day 1996, the Vietnam Veterans Memorial Fund (VVMF) unveiled a half-scale replica of the Vietnam Veterans Memorial in Washington, D.C., designed to travel to communities throughout the United States.