The marines did field a squad level radio that allowed squads to communicate with their PHQ. The Korean era AN/PRC 6 was a short range, FM band, ‘walkie-talkie’ type set. If they were issued at all, then they would have carried by the squad leader.
If the squad was going to operate at any distance from the platoon or company, then they would have been issued with a AN/PRC-25 or its replacement set, the AN/PRC 77.