The first season was shot in Hawaii, starting with this episode the last 2 seasons were shot in California in the same valley that M*A*S*H was shot in.
Starting with the season, the unit patch changes, as does the overall tone of the show.
Kim Delaney joins the cast as reporter Alex Devlin with information about the upcoming Tet Offensive.
Tan Son Nhut was and still is an international airport in the northeast suburbs of Saigon. There are no mountains or foothills nearby. Roads from the airbase to downtown Saigon are all paved and congested.
Dan Gauthier joins the cast as a hotdog pilot, similar to the role played by Cruise in Top Gun (1986).