In my experience, older Okinawans do not think fondly of the Japanese military. The empire took over and treated them like second class citizens, drafting them into the war and only telling them about their "duty as Japanese citizens" to die for the emperor once they became the shield for the main islands, as if victory was an option once the allied troops were hitting Japanese soil. They told them about all the horrible stuff the Americans would do to them and their loved ones if they took the island, famously urging them that suicide was a better fate. When none of that came to pass, they had realized how badly abused they had been by the imperialist army.
The younger folk are more focused on the modern problems arising from the US military presence on the island, but the Okinawans I've met who were around at the end of the war look much more favorably on the Americans than the Japanese military.