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Grease for tank tracks...phew! When I was a young, 18 year old tanker in 1955, I served with PFC Terry, a grizzled old tanker/lifer.
Old Terry (he may have been nearing 40), had some very ugly stories to tell, relating to being a tanker entering Germany, and meeting the Volkssturm..that is the old men and Hitler youth who fought many times. to the death.
BTW: Terry was a PFC when I knew him...but he was previously a warrant officer. He found out though, that while a warrant officer can argue with a 2nd lieutenant, beating the lieutenant's butt, was out of the question.