HIMARS destroyed Russian positions and depots, allowing Ukraine to retake a huge swath of territory.
But Russian forces adapted and were able to limit HIMARS' effectiveness in fighting around Kherson.
It was initially devastating, but Russian forces eventually learned how to cope with it, according to two US defense experts.
GPS-guided rockets fired from the truck-mounted mobile launcher destroyed Russian headquarters and especially ammunition dumps, which helped curtail Russian artillery fire.
Ukraine had access to US intelligence, surveillance, and reconnaissance "that played an important role, but due to political parameters was untouchable by Russia," Kofman said.