MASH - Season 5 Episode 8 -

After Frank discovers that Danny Fitzsimmons has shot himself to get out of combat, Father Mulcahy is called in. Realizing his lack of understanding of the fighting, Mulcahy accompanies Radar to an aid station, where they encounter the real war at first hand. Mulcahy performs an emergency tracheotomy, guided by Hawkeye over the radio.