 Complete the following phrase:  The first Spey-powered A-7E flew for the first time on 9 March 1969. The A-7E differed from the USAF A-7D in retaining the probe-and-drogue midair refueling system of the earlier A-7AB. It entered service in Southeast Asia in May 1970 with VA-146 and VA-147 deployed aboard . The A-7E participated in numerous close-air support missions over both North and South Vietnam, with its state-of-the-art bombing and navigation system being particularly reliable and accurate. Most air wings operating A-4 Skyhawks and early A-7s were re-equipped with A-7Es. The A-7E participated in the mining of Haiphong harbor in 1972, and played a vital role in Operations Linebacker I and 