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This was the 1940s veterans’ attempt to get help from Washington.
https://www.google.com/search?sca_esv=0498115c76c36171&q=1940s++bonus+army+camps&uds=AMwkrPuKiz3kd7jHuta4ar-HNLVtotrROJPp49ws2P

At least 259 men were killed and “the final indignity was mass cremation.”
The GI Bill was passed later partly as a reaction.

From the Bill of Rights Institute: The bonus Army.

“On June 15, the House of Representatives passed the new bonus bill by a vote of 211 to 176. Two days later, some 8,000 veterans massed in front of the Capitol as the Senate prepared to vote, while another 10,000 assembled before the raised Anacostia drawbridge. The police were anticipating trouble because of the large crowds. The Senate debate continued until after dark. Finally, at 9:30 p.m., Waters learned that the bill had been defeated and shared the news with his followers.”

“When it appeared that the bonus would not be paid, many of the marchers refused to leave, and President Hoover ordered the Army to evict them. Using tear gas, tanks, and a troop of saber-wielding cavalry commanded by Major George S. Patton, U.S. Army chief of staff General Douglas MacArthur drove the marchers out of Washington and burned their main camp on the Anacostia Flats.”