[457] Their respective locations were: 7th Division, at the extreme right of I Corps sector; and further east, the 3d Division occupied the corresponding right flank of IX Corps sector. VMF-311 concentrated on the 7th Division targets while VMF-115 efforts were devoted primarily to the 3d Division. Hitting an all-time high in the annals of memorable days, this, the seventeenth of April not only further proved MAG-33’s ability to cripple the enemy’s already diminishing strength but it also allowed VMF-115 to set records in total airborne sorties launched in a single day plus a record total ordnance carried and expended in one day by jet type aircraft.[458] [458] MAG-33 ComdD, Apr 53, p. 51. VMF-115 alone, with 30 pilots and 23 aircraft, had flown 114 sorties and delivered 120 tons of bombs on North Korean targets. A sample of the intensity of this maximum day was a series of three early-morning interdiction strikes led by three VMF-115 pilots that launched the effort. Led by Lieutenant Colonel Joe L. Warren, Major Samuel J. Mantel, Jr., and Major John F. Bolt, the 23 attacking Panther jets lashed the objective with 22.35 tons of ordnance and 4,630 rounds of 20mm ammunition. The three missions destroyed half of the buildings and inflamed 95 percent of the target area in the enemy supply concentration point T’ongch’on on the Korean east coast. By contrast, wing operations in May were considerably hampered by the bad weather peculiar to this time of the year in Korea. Restricted flying conditions were recorded for 18 days of the month. A total of 153 CAS sorties were flown for the Marine division before its 5 May relief from the front lines. Of the wing’s 3,359 sorties[459] during the month, 1,405 were for close support to forward units beating back Communist encroachment efforts. The allocation of CAS sorties was 412 for U.S. infantry divisions (including 211 for the 25th Division occupying the customary Marine sector); 153 for the 1st Commonwealth Division at the Hook which the Communists assaulted on 27–28 May as part of their overall thrust against western I Corps defenses; 412 sorties for ROK units; and 63, miscellaneous. Heaviest action for Marine aviators took place towards the end of the month to thwart enemy blows in the I Corps sector where Army and Turkish units were attempting to repulse the Chinese. [459] This figure does not include sorties by VMA-312 (carrier-based), VMO-6, or HMR-161, the latter two under operational control of the 1st Marine Division.