People living near 36th St. And Camelback Road in Phoenix were left terrified when the Blackhawk chopper swooped close to their homes on October 31.
Many believed that their streets were under some kind of attack.
"I didn't know if it was going to be a crash, or an attack, no clue," one neighbour told the Fox 10 News channel.
"When I came out it was nose down, and it was definitely military," another person said.
Also Read
But they decided to make the spooky impromptu stop midway, leading to the incident.
The Arizona National Guard launched a probe after seeing the video posted online.
"The incident was not sanctioned by the Arizona National Guard and will be investigated further to ensure it does not occur again," an official statement said.
The names of the crew members will not be released until the investigation is completed, the statement added.