Who was the most effective president in the cold war and who was the least?

Truman was effective, he resisted the communists with military force in the Korean War. Eisenhower was effective, he sent the first US Servicemen to Vietnam in 1955. Kennedy was effective, he sent the Green Beret (Special Forces) to Vietnam in 1961. Nixon was effective, he took General LeMay's Words seriously, and B-52'd the North Vietnamese Government back to the negotiating table (LeMay's Words were, "...bomb them back into the stone age..."). Johnson was effective with his Tonkin Gulf Resolution approval, and his Air War offensive in 1965, Operation Rolling Thunder (Bombing campaign over North Vietnam). But he became "least" effective when he let the Vietnam War destroy his administration; in essence he quit. Johnson went on nation wide public television and stated that he would no longer serve as president for the American people. He hated the Vietnam War, and was fed-up with it!