At times people have been commissioned into officer ranks directly. Usually when they had a special skill. Doctors have come in as LTs (Captains) in WW2 for example. Other examples exist. They are not given positions in the combat chain of command.
During the war we had surgeons with no military background report as Navy Reserve Captains (O6) for assignment to an active duty command! Many more as Commanders, O5. They were often very hard to deal with. I had to keep telling one doctor to button his shirt pocket, get his hands out of his pockets and get his cover straight on his head because this was the Navy not the Army. It became a game but he never got pissed. We had talked he knew it was my responsibility keep him squared away and I was always respectful. After he transferred to BUMED in DC, he came back to give us a brief on medical issues for returning Reservists. In the middle of the brief I leaned over told him to get the pen out of his shirt pocket and button the pocket. He told me latter he was so pissed at himself. He checked himself in the mirror prior to the brief just to make sure the Chief could not find anything wrong with his uniform.