I want to know the answer to the following question:
Von Neumann testified at whose hearing about loyalty and help?
All the background I'm provided with is that "Despite his disagreement with Oppenheimer over the need for a crash program to develop the hydrogen bomb, he testified on the latter's behalf at the 1954 Oppenheimer security hearing, at which he asserted that Oppenheimer was loyal, and praised him for his helpfulness once the program went ahead.". Is that enough to answer the question?
Answer: yes