I worked for 19 years in the ROC. So was very interested in Oppenheimer. How the bomb was made, the tests and finally the dropping of the bomb on Japan. Although many people were killed it did bring an end to the war. Our men came home. The director did well in the casting, the clothes, haircuts etc very authentic. I do hate directors who have undercuts rather than short back and sides. Not afraid to cast white actors where he could have chosen 6 black actors to play those parts. On the whole 4 stars.