The United States circa 1977 is very different than the United States 2017. 1977 is still the height of the Cold War and a time when Tom Clancy of all people wrote a novel glamorizing Afghan Taliban fighting against the Soviets. 2017 we're the tottering empire exhausted and weakened due to years of hit and run attacks against us by determined groups of Rebels. In 1977 the war against the Nazis is still pretty fresh and so the villainy of the Stormtrooper helmets is clear. In 2017, Stormtrooper helmets resemble most actual US Army helmets, while the light robes that the Rebels wear resemble jihadi gear.