Here is the blurb
M45 tank of the Headquarters and Service Company, 6th Tank Battalion,
crossing the Kum river, Septermber 16, 1950 during the breakout from the Pusan Perimeter.
The M45 was essentially an M26 tank with a 105mm howitzer in place of the 90mm gun.
Records indicate the 6th Tank Battalion was the only unit in Korea equipped with these tanks
and M46 tanks had replaced all of them by early 1951. (NACP)

Source
Battle Orders
US Army Foreces in the Korean War 1950-53
Osprey Publishing
ISBN 1-84176-621-6