Whats the purpose of the stuka siren https://youtu.be/LCB8ZVxKqyI You would think fear, since a new soldier would be scared out of his boots. but its a obvious warning for soldiers to get down, and the older soldiers would dive for cover.
Found an older post here asking this question - the answers given are accurate by my recollection:
https://www.reddit.com/r/AskHistorians/comments/227hu2/why_did_the_stuka_have_a_siren/
Edit: The first answer was provided by an account that has since been deleted - sorry mods. An insightful follow-up response about a contributing factor to the sirens being eventually removed was their impact on performance of the aircraft was provided by u/Brickie78.