What was the purpose of operation rolling thunder

Explanation: According to the World Wide Web: "The four objectives of the operation (which evolved over time) were to boost the sagging morale of the Saigon regime in the Republic of Vietnam; to persuade North Vietnam to cease its support for the communist insurgency in South Vietnam without sending ground forces into communist North Vietnam; to destroy North Vietnam's transportation system, industrial base, and air defenses; and to halt the flow of men and material into South Vietnam"