I was going to mention Potter and 1952 and then him being old year in 1951 for New Years eve but someone already listed it. The episode when they went through a whole year and had him at the end of 1951 but it said he came in 1952. I might have the years wrong. This episode and some of last season had the most changes, we had exit Trapper enter BJ, exit Colonel Blake and Major Burns enter Colonel Potter and Major Winchester that all seemed to happen quickly like in a season or so time. I like Trap better, than Winchester, but I think I liked Potter better than Blake but not by much. I liked Burns because he was the only one who actually was on the side of his country even though the liberal writers made him a sneaky jerk of a guy.
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