What are the Leadership positions in the Troop?

The Senior Patrol Leader is elected by the Troop members and he is the Youth Leader of the Troop. Then there is the Green Bar Patrol who are also elected and they are his Assistant Senior Patrol Leaders. Then there are the Patrol Leaders, who are elected by their Patrol and the Assistant Patrol Leaders who can be elected by the Patrol or can be assigned by the Patrol Leader. Then there are the other Troop Leadership positions including Scribe, Librarian, Historian, Chaplain Aide, Instructor, Leave No Trace Trainer, O/A Rep (must be an OA member), Bugler, Den Chief, Troop Guide and Junior Assistant Scout Master.