Conversation so far:
What did Slim Pickens' film career consist of?
During much of his career, Slim Pickens played mainly cowboy roles, and is perhaps best remembered today for his comic roles in Dr. Strangelove, Blazing Saddles and 1941.
Who did Slim Pickens work with?
Slim Pickens had a small but memorable role in Steven Spielberg's 1941 (1979) in scenes with Toshiro Mifune and Christopher Lee.

Question: What was his greatest accomplishment mentioned in the article?
Self-contained rewrite: What was Slim Pickens' greatest accomplishment mentioned in the article?