Secretary of Defense Robert McNamara poses on Feb. 1, 1968, with Chairman John Stennis of the Senate Preparedness subcommittee before a closed door hearing. McNamara, retiring defense chief, was called to outline plans and budget requests for the year ahead. Stennis of Mississippi, said before the hearing that âäexpansion of the warâä in Vietnam probably will require additional manpower above the 525,000 United States forces now earmarked for Southeast Asia. (AP Photo/Henry Griffin)