ORIGINAL: Pershing.Driver
I found a picture off a 6th tank M45 in Korea crossing a river on the Pusan break out - it had the periscope guards over the two middle periscops as well as the two front hatches.
Meaning the Pusan Perimeter? I didn't think there weren't any M45s during the Pusan Perimeter. I thought that those came later.
As I recall, the first medium armor to arrive in Pusan (or Korea for that matter) were the Marines' M26s...and those were new to the Marines (1st Tank Bn, I think). The Marines never had the M45. They used the M4A3(105) instead as a support tank. Later in the war, they started to receive the M46s.