WASHINGTON, March 17--The United States said today that South Vietnam has developed a sound central plan for fighting the Communist Vietcong, including national mobilization, creation of a highly trained guerrilla force, and new equipment.

Full U.S. support was pledged "for as long as it is required to bring Communist aggression and terrorism under control." And there were indications the United States will provide some increased military and economic aid.

The war in South Vietnam has been running steadily against that country in recent weeks, but a statement, issued after Secretary of Defense Robert S. McNamara and Gen. Maxwell D. Taylor, chairman of the Joint Chiefs of Staff, reported today to the National Security Council on their recent fact-finding trip to South Vietnam, said that significant improvement is possible in the "coming months."

during an election year in favor of a bill that included a $10,000 raise for themselves.

The defeated bill included raises for 1.7 million employes in the executive, legislative, and judicial branches of the federal government. A new measure with such pay boosts but leaving out members of Congress was introduced Monday.