Carter Defends Plan to Reduce Forces in Korea
Pres Carter, emphasizing staunch commitment, defends plan to withdraw ground forces there and expresses confidence that S Korea is strong enough to repel any attack, news conf; calls Singlaub's public criticism of plan a 'serious breach' of his responsibility; says that Singlaub was not being fired, chastised or punished, but would be transferred to new position at equivalent degree of stature and responsibility; illus of S Koreans demonstrating against withdrawal (M)