Bugle calls were used in military camps to signal the day's schedule without spoken orders, and reveille was the call for waking troops and raising the flag at sunrise. This recording comes from a military bugle calls collection and has circulated online as a short alarm clip. Renamed 'wake up lil bro' by meme editors, it spread in short videos where an overly official trumpet blast is used to wake friends, pets, and fictional characters, and it remains popular because everyone instantly recognises its purpose.