I’m fairly familiar with military ranks and their insignia, owing to numerous friends and family who have served in the military and a general interest in reading about it. But I’ve never seen this one. Here is a picture of it, from the film. And no, I’m under no illusions about accuracy of military depictions in movies and shows. Still, it makes me wonder.
It’s basically three gold bars. Just like the bar of a second lieutenant, but three of them, linked together the same way as the silver bars of the Army/Marine/Air Force Captain or corresponding Navy Lieutenant. I did some Googling. I’ve seen pictures of this insignia among lists of ROTC and JROTC ranks.
Indeed, the characters in that movie are in fact officer candidates. But they are not ROTC, they’re part of what is apparently some kind of direct Naval Aviator commissioning pipeline for college graduates. They’re referred to as AOCs, Aviator Officer Candidates.
Is this rank insignia worn by such candidates in real life, or is it an invention for the movie?