Substitution of the previous interdiction strategy by PRESSURE attacks brought increased close air support to frontline troops. As a result of this expanded number of CAS sorties, wing pilots and ground forward air controllers greatly increased their operational proficiency.[239] The Marines were still not satisfied with the close support picture, however, and neither were a number of U.S. Army commanders. Some of the latter regarded General Clark as the champion of more extensive close air support missions for frontline units, but he quickly dispelled this view. Instead, he cautioned these supporters of Marine-type close air support to accept the existing procedures, which were derived from the “vast reservoir of experience ... [representing] the composite view of senior members of the Armed Forces [with] the longest and most responsible experience in close support during World War II.”[240] At the same time the UN commander, on 11 August 1952, had advised his force commanders to study the factors affecting the close air support situation in Korea and comment on certain UNC proposals for improving the CAS system. [239] _PacFlt EvalRpt_ No. 5, p. 9-53. [240] _Ibid._, p. 9-143. In the close air support picture for the Marines, October was a bright month. In the outpost battles of early October, the 1st MAW put 319 sorties in the air during both day and night to strike, strafe, bomb, and burn enemy positions and troops facing General Pollock’s division. A new level of achievement had been reached during the Bunker Hill battle in August. That month nearly 1,000 aircraft, predominantly Marine, loosed ordnance at targets on and near the Chinese MLR and OPLR. During the first six months of Marine ground operations in defense of JAMESTOWN, wing squadrons and pilots had made major contributions to the U.S. air effort in Korea. On 7 June 1952, First Lieutenant John W. Andre, VMF(N)-513, piloting a World War II model Corsair on a night armed reconnaissance mission over the west coast of North Korea, shot down an enemy piston-driven Yak fighter. It was the first time that a Russian-built plane of that model had been knocked out of the skies at night by another plane. This aircraft was also the fifth kill for the lieutenant, making him the first Marine nightfighter ace in Korea.[241] [241] The first Marine night ace was Captain Robert Baird, who shot down six Japanese planes between 9 June and 14 July 1945. Sherrod, _Marine Aviation_, p. 404. Lieutenant Andre’s first four planes were also downed during World War II. See Appendix F for Marine air kills during the Korean War.