 Complete the following phrase:  Following graduation from Purdue, Lamb was accepted into the United States Navy Officer Candidate School. Upon completion of his training, he served 18 months on the attack cargo ship , and then moved to the Pentagon where he served in the audiovisual office of the Assistant Secretary of Defense for Public Affairs. Lamb took up this role midway through the Vietnam War and, in addition to handling queries from radio and television networks, he attended press briefings with Defense Secretary Robert McNamara. In July 1967, following 