When did Johnson become president?

Johnson took on numerous minor diplomatic missions, which gave him limited insights into international issues. He was allowed to observe Cabinet and National Security meetings. Kennedy did give Johnson control over all presidential appointments involving Texas, and he was appointed chairman of the President's Ad Hoc Committee for Science. When, in April 1961, the Soviets beat the U.S. with the first manned spaceflight Kennedy tasked Johnson with coming up with a 'scientific bonanza' that would prove world leadership. Johnson knew that Project Apollo and an enlarged NASA were feasible, so he steered the recommendation towards a program for landing an American on the moon.