Which actor or actress won an Oscar for the 1978 film 'The Deer Hunter' about the war in Vietnam?

Explanation

The Vietnam War (1955-1975) left a huge impression on the American self-perception, and several of the biggest films in American film history centre around it. An example is 'The Deer Hunter' from 1978, for which Christopher Walken won an Oscar. Stanley Kubrick's film 'Full Metal Jacket' also became a classic, but Francis Ford Coppola's film 'Apocalypse Now' from 1979 is perhaps the greatest film about the era. Robert Duvall's unforgettable line 'I love the smell of napalm in the morning' falls in this film.