Assuming you're referring to Frederick Lucas, he says that the preamble to the Declaration of Independence "sets the tone" for the rest of the document by making it clear why exactly the founders have submitted it.
It is known as the BONUS ARMY . In the summer of 1932, World War I veterans, families and affiliated groups gathered in Washington DC to demand cash- payment redemption of their service certificates.
The media called them BONUS MARCHERS or BONUS ARMY. It was led by Walter W. Waters, a former sergeant.