During WW II, the US navy used the island in Southern Pacific to build a military base and when the islanders met the American soldiers it was a tremendous cultural shock. The islanders have believed that the Americans were demi-gods. During this period, John Frum, an American pilot landed on Tanna. No one knows him except the islanders. They believe that John Frum is their prophet and they still wait for his return. Their customs have been shaped by this belief.