"Souvenirs" (Season 5). Pole sitting. This ploy fails because Colonel Potter turns the tables on him and encourages him to stay up longer than he intended in order to break the MASH pole sitting record. In the end, Klinger fails to leave the army but is proud to break the record.

Does Klinger get discharged?

In None Like it Hot, Colonel Potter agreed to give Klinger a discharge if he could wear a body/water reducing suit for 24 hours during a heatwave, but the heat proved too much even for Klinger, and he gave up with only an hour left to go.

What happens to Klinger in mash?

In the final M*A*S*H series episode, "Goodbye, Farewell, and Amen," the story continues: Soon-Lee is still on the base and trying to find her parents. ... Contrary to everything his character has been and done since Season 1, Klinger decides to remain in Korea until Soon-Lee finds her parents.