Source: not available
The following is an ecerpt from an article by Sue Anne Pressley in the Washington Post entitled When History, Destiny Converged on March 30, 2006:
When Jerry Parr was a kid, his father took him to see the movie "Code of the Secret Service" (1939). One of the lead characters, agent Brass Bancroft -- played by Ronald Reagan -- made such an impression on the young boy that he later decided to join the Secret Service. More than 40 years later, Parr would marvel that he had helped save this same man, then president of the United States.
The article goes on to describe how Parr was the agent who on March 31, 1981 directed the presidential limo to go to the hospital rather than back to the White House after Ronald Reagan was shot by John Hinkley.