I found that this article helped answer that question:
http://www.independent.co.uk/news/obituaries/ivan-dixon-kinchloe-in-hogans-heroes-829237.html
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Robert Clary and Kenneth Washington. Richard Dawson died recently, Clary played LeBeau and Kenneth Washington replaced Ivan Dixon (Sgt Kinchloe) in the show's final year.
Kinchloe was played by Ivan Dixon. He was responsible mostly for the radio and telegraph communications. Hogan once said he was Chief of Operations.
He didn't get along with the other members of Motograter. If you listen to his interviews on YouTube, he talks about how the business side of the industry almost made him leave it behind forever.
Ivan Saliaris goes by Ivan Salfa.
The Tale of How Ivan Ivanovich Quarreled with Ivan Nikiforovich was created in 1835.