Filmed near the site of contemporaneous nuclear testing grounds, the set was contaminated by nuclear fallout. After location shooting, much dirt from the location was transported back to Hollywood in order to match interior shooting done there. Scores of cast and crew members developed forms of cancer over the next two decades, many more than the normal percentage of a random group of this size. Quite a few died from cancer or cancer-related problems, including John Wayne, Susan Hayward, Pedro Armendáriz (who shot himself to death soon after learning he had terminal cancer), Agnes Moorehead, 'Thomas Gomez' , John Hoyt and director Dick Powell. People magazine researched the subsequent health of the cast and crew, which it published in November 1980. By the time of the article's publication, 91 of the 220 members of the film's cast and crew had contracted cancer, and half of these had died from the disease. The figures did not include several hundred local American Indians who served as extras on the set. Nor did it include relatives who had visited cast and crew members on the set, such as the Duke's son Michael Wayne. The People article quoted the reaction of a scientist from the Pentagon's Defense Nuclear Agency to the news: "Please, God, don't let us have killed John Wayne".