I think that task was performed by Marine Civic Action Platoons, not Force Recon.
Perhaps further clarification is needed. In 1960, I was stationed on the USS Princeton (LPH-5) in the Marine Detachment. We took on board a Marine Force Recon platoon on their way to Hawaii for low altitude egress from helicopters. They were training for 50’ jumps without rapelling. By the time we reached Hawaii, they were jumping over the railing on the O-2 deck (right below the flight deck) onto the steel hangar deck, without injury!
OK, the story they told us was how they had infiltrated a small town in TN, blew the bridges, cut the phone lines and held everyone prisoner for a week. Scuttlebutt, maybe. But when four Force Recon guys, with a mission to blow a bridge and set up a radio station, got lost; 76 out 85 ships were pulled out of a SEATO operation to find them. As their LT said: “You don’t understand, their mission is to blow a bridge and set up a radio station, they don’t care if the bridge is on an island or Red China.”