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Thank you!
From their info page:

FACT SHEET

Incorporated in 1995, Rolling Thunder, Inc. is a class 501(c) (4) non-profit organization with over 90 chartered chapters throughout the United States and members abroad. While many members of Rolling Thunder®, Inc. are veterans and many ride motorcycles, neither qualification is a prerequisite. Rolling Thunder®, Inc. members are old and young, men and women, veterans and non-veterans. All are united in the cause to bring full accountability for the Prisoners Of War-Missing In Action (POW/MIA) of all wars, reminding the government, the media and the public by our watchwords: “We Will Not Forget.”

The Rolling Thunder®, Inc. Story

In the fall of 1987, Artie Muller and Ray Manzo, two Vietnam veterans met to discuss their personal concerns about the POW/MIA’s from the Vietnam War. Having honorably served their country and having taken an oath to “support and defend the Constitution of the United States against all enemies...” and to “bear true faith and allegiance to the same,” they were deeply troubled by the abhorrent neglect of attention given to those who did not make it out with their lives or their freedom. These veterans discussed the more than 10,000 reported sightings of live Americans living in dismal captivity. Intelligence reports of these sightings were generally ignored by the government and mainstream press.

The First Rolling Thunder®, Inc. Demonstration

The Founders of Rolling Thunder®, Inc., Artie Muller and Ray Manzo, were ordinary men who understood that they had a right to have their voices heard and proceeded to lay down the plans for a gathering in Washington, D.C. during the 1988 Memorial Day weekend. They reached out to their families, fellow veterans and veteran’s advocates to unify and form a march and demonstration in the nation’s Capital. Their arrival would be announced by the roar of their motorcycles, a sound not unlike the 1965 bombing campaign against North Vietnam dubbed Operation Rolling Thunder. Hence, they would call themselves “Rolling Thunder®, Inc.” a title that would endure time and be trademarked in 1990. Word spread quickly and by Memorial Day weekend in 1988, approximately 2,500 motorcycles from all over the country converged on Washington, D.C. to demand from our leaders a full accounting of all POW/MIA’s. As the Founders of Rolling Thunder®, Inc. made their stand that day in front of the Capitol, they reflected thankfully for the people who came in support of the POW/ MIA’s and for the unity that was felt. This was the first Rolling Thunder®, Inc. demonstration. Only until ALL POW/MIA’s ARE ACCOUNTED FOR, it will not be their last. On that day, the foundation was laid for the annual “Ride for Freedom” to the Vietnam Veteran’s Memorial Wall (also referred to as the “Ride to the Wall”). The number of participants/spectators in the Memorial Day weekend Ride for Freedom has grown from 2,500 to an estimated 900,000.
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