Army and Marine active duty units alike were deployed to LA in 1992 due to the Rodney King verdict of the goon flatfoot cops being not guilty. Active duty units deployed were the Army’s Ready Brigade of the7th Infantry Division based in central California at Fort Ord in Monterey and a battalion of Marines from I Marine Expeditionary Force based at Camp Pendleton.
From the Marine publication
Leatherneck linked below....
By the time Cole and the other Marines of his regiment had gathered for formation at Pendleton’s Camp Hornoon Friday, May 1, [1992], the violence had resulted in 31 deaths, more than 1,000 injuries, and about 3,800 structure fires. With media watching, the Marines received riot control training and prepped for their entrance into the streets of LA. The approximately 1,500 Marines who deployed to LA, many of them veterans of Operation Desert Storm, were not trained to quell riots or respond to civil disturbances. Cole, the lance corporal in 3rd Battalion,1st Marines, recalls receiving a “crash course” in riot control training at the Marine air station in Tustin, where the Marines were staged before moving into the streets. With camera crews and other members of the media watching, Cole said he and the other Marines received riot gear and learned different riot control formations.
The Army and Marine active duty troops bitched and complained they didn't want to do it and hated doing it. For weeks afterward the Marines in particular griped and objected to having to do the deployment.
This deployed battalion now on the scene is the same as in 1992, of the 7th Marines of the 1st Marine division which is a unit of especially high quality. Those Marines in '92 were vocal against the deployment well after they had returned to their barracks. The Marine Corps changed their battalion commander by sending in a Lt.Col. named John Kelly as the new CO. This is the Marine Gen. retired John Kelly we know from recent times and Trump. Kelly settled the battalion down to include assurances by the Corps the unit would never again be deployed into the streets of America. I'm sure that right now Kelly remembers this well.
This is a good straightforward matter of fact account of the Marines deployment to the LA riots of 1992 published in the
Leatherneck in 2020.
1992: Rioting in Los Angeles
Examining the Sequence of Events, Protocol And Ultimate Call to Send in the Marines