according to the character profile in the manga (I think it was in book 2), Leon is 24 years old.
Good, then I'm not too far off. In book 10 Vesca said that Leon had been investigating D for nearly two years, which would make him roughly 25-26 depending on how far into his 24th year he was when he started.
According to one site I visited, you have to be a police officer with the LAPD for a minimum of four years before you can be promoted to either a detective or sergeant. Detectives are, apparently, more investigative, while Sergeants are more field supervision. I'm not sure about the higher ranks of Detective, but I think you're right - Leon doesn't have the personality to be political and I doubt he’d make serious advancements if diplomacy is necessary.
no subject
Good, then I'm not too far off. In book 10 Vesca said that Leon had been investigating D for nearly two years, which would make him roughly 25-26 depending on how far into his 24th year he was when he started.
According to one site I visited, you have to be a police officer with the LAPD for a minimum of four years before you can be promoted to either a detective or sergeant. Detectives are, apparently, more investigative, while Sergeants are more field supervision. I'm not sure about the higher ranks of Detective, but I think you're right - Leon doesn't have the personality to be political and I doubt he’d make serious advancements if diplomacy is necessary.