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KOREAN WAR FIRST MARINE TANKS BATTALION IN SUPPORT OF TURKISH BRIGADE - A 1st Marine Division tank crew member is careful not to let the hatch door slam against his tank, as he climbs out to inspect his tank after received three harmless 76 Howitzer hits. NARA FILE #: 127-GK-234D-A173204 Either M26A1 or M46. It seems there is a small additional idler between the last road wheel and the drive sprocket. If so, it's M46.
It's an M46, notice the pioneer rack on the glacis plate and the sprocket is mounted higher for the new transmission. All M46s were remanufactured M26s.