Not a decision the United States ought to rush into.

 From The Coldest Winter by David Halberstam.  Page 94.

That night, all the top military and civilian people dined at Blair House. After dinner they took up the subject of the invasion. Some things were already becoming clear: no one knew how deep the North Korean penetration was, but this was clearly a major invasion and the South Korean forces were not fighting well. They would not be able to hold on their own. After dinner, General Omar Bradley, the chairman of the Joint Chiefs, who had favored pulling American combat troops back from Korea a year earlier because it would be such a terrible place to fight and because it was deemed of so little strategic value, was the first to speak. A line had to be drawn against the Communists, he said, and Korea was as good a place to do so as any. Its value had changed overnight. Truman interrupted to say that he agreed completely. In that moment, the die was cast. Bradley added that, given the size of the attack, the Soviets had to be behind it. Then Admiral Forrest Sherman, the chief of naval operations, and General Hoyt Vandenberg, Air Force chief of staff, spoke. Each reflected the optimism—and dependence—Americans felt about their air and naval superiority, as well as each man’s belief in the unique powers of his own service. Neither had very much respect for the fighting abilities of the North Korean Army. Each was confident that air and sea power could turn back the North Koreans. But Joe Collins, the Army chief of staff, said that based on the reports he was getting, it was likely American ground forces would also be necessary. The commitment of ground troops was a very different—much graver—step. Bradley, Collins, and Frank Pace, the secretary of the Army, all insisted that was not a decision the United States ought to rush into. Bradley would soon note, however, that he had underestimated the force and the ability of the North Koreans. “No one believed that the North Koreans were as strong as they turned out to be,” he later testified.