Monthly draft calls will increase from 17,000 to 35,000 - the highest level since the Korean War, when between 50,000 and 80,000 men were called up each month.
It will take the US force in Vietnam up to 125,000 but officials say at this stage demands should be met by conscription, without calling upon the reserves.
President Johnson | ||||||
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Speaking in a televised address from the White House President Johnson said: "We do not want an expanding struggle with consequences no one can foresee."
"Nor will we bluster, bully or flaunt our power. But we will not surrender, nor will we retreat," he continued.
The President gave the news conference after a week of intensive talks with senior military and security advisers in Washington.
He explained the decisions were in response to requests made by General Westmoreland, the US Commander in the South Vietnamese capital, Saigon.
Mrs Johnson and her daughter looked close to tears as Mr Johnson admitted: "I do not find it easy to send the flower of our youth, our finest young men, into battle."
The US leader also made clear his desire for peace and recalled the - unsuccessful - efforts of 40 countries to bring an end to the fighting on 15 occasions.
He called upon the United Nations to redouble its efforts to restore peace to Vietnam and detailed a personal letter to that effect being personally delivered to the UN Secretary-General, U Thant, in New York by the new US Ambassador to the UN, Arthur Goldberg.
The Secretary of State, Dean Rusk, and the Secretary of Defence, Robert S McNamara, are to persuade Congress of the need to finance the US' new military commitments, in the light of a reduced defence budget this year.
President Johnson explained: "We intend to convince the communists that we cannot be defeated by force of arms or by superior power."
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Original text found @ [news.bbc.co.uk/onthisday...](http://news.bbc.co.uk/onthisday/hi/dates/stories/july/28/newsid_2754000/2754033.stm)