M*A*S*H
Preventive Medicine
TV Flash files “Preventive Medicine” as hour 166 of 251 in the TV Flash guide — M*A*S*H (1972–1983) on CBS, season 7, episode 22, aired 1979-02-19, 30 min.
From the desk
How this hour is filed
This leaf is S07E22: listed hour 166 of 251 in the M*A*S*H guide, hour 22 of 25 in season 7. It aired 1979-02-19 (30 min). The listed hour before it is “Rally Round the Flagg, Boys” (S07E21). Next is “A Night at Rosie's” (S07E23).

Catalog log
Broadcast listing — not a TV Flash recap.
A careless colonel increases the number of seriously wounded soldiers arriving at the 4077th. Klinger makes a Voodoo doll of Colonel Potter in an attempt to get a section 8.
Viewer FAQ
Where does Preventive Medicine sit in the M*A*S*H guide?
S07E22 is listed hour 166 of 251 — hour 22 of 25 in season 7, season 7 episode 22.
When did M*A*S*H S07E22 air?
Preventive Medicine aired 1979-02-19 and is listed at 30 minutes.
Where should I start if I cannot watch all eleven seasons?
Start with the 1972 pilot to learn the tent's manners, then jump to Sometimes You Hear the Bullet and Abyssinia, Henry. Those three hours teach the joke-to-wound contract better than a clip reel.
In the series
Why this series still plays
Eleven seasons of a network comedy that kept rewriting its own permission slip — Korea as the set, Vietnam as the aftertaste, and a goodbye still quoted whenever someone needs proof a sitcom can stop the country.
February 28, 1983, CBS did not program a sitcom. It programmed weather. Goodbye, Farewell and Amen ate the night, the morning papers, and a ratings myth executives still quote like scripture — a two-and-a-half-hour close on a Korean War tent America had been visiting since September 1972. The helicopters were already folklore. The laugh track, by then, had learned when to shut up. On the palate: canvas, cigarette haze, and a three-act clock that could turn a punchline into a casualty without changing the lighting.
Filed against
- Alan Alda as Capt. Hawkeye Pierce
Alan Alda defined 1970s television as Hawkeye Pierce on M*A*S*H, blending scalpel wit with antiwar ache until a two-and-a-half-hour goodbye stopped a nation. Actor, writer, and director of the series’ later seasons, he proved a sitcom…
- Loretta Swit as Maj. Margaret Houlihan
Loretta Swit’s Maj. Margaret Houlihan is the officer M*A*S*H had to let grow up — the Army nurse who started as a punchline and became a person inside CBS’s Korean War tent. Eleven seasons of gallows humor as appointment TV needed a…
- Jamie Farr as Cpl. Maxwell Klinger
Jamie Farr’s Cpl. Maxwell Klinger is M*A*S*H as a section-eight gag that grew a soul — dresses, Toledo longing, and wartime comedy that refused to leave him a punchline. Harry Morgan restabilized command; Farr restabilized the joke. On TV…
- Harry Morgan as Col. Sherman Potter
Harry Morgan steadied M*A*S*H as Col. Sherman T. Potter after the command shuffle — horse sense, heart, and wartime comedy craft. Dragnet-era roots as Officer Bill Gannon made him institutional memory on legs. On TV Flash he is the…
- Gary Burghoff as Cpl. Radar O'Reilly
Gary Burghoff played Cpl. Radar O'Reilly on M*A*S*H — the company clerk as the tent's nervous system, gallows humor that could hear the helicopters before the laugh track did. TV Flash files him as 4077th craft: the kid who made a war…