I just saw this episode recently for what seemed like the millionth time, and the story of Captain Jonathan Tuttle who went to Berinish Poytechnic university never gets old and it never loses its charm!
Hawkeye creates Tuttle (an imaginary friend he had as a kid) and manages to get all of of his back pay given to the orphanage. This is Classic Hawkeye at his best.
Its amazing how Hawkeye, Trapper and Radar managed to pull off such an insane stunt without anyone in the camp or even General Clayton being able to figure it out.
One of the best episodes of M*A*S*H!