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In TNG, Riker is the first officer and has the rank of Commander. Lt. Commander Data is the 2nd officer, yet Crusher outranks Data. Why is it that he's the 2nd officer and she isn't?

Where does she fit into the command hierarchy?

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    @dmckee - Dr. Crusher later captains the USS Pasteur.
    – Valorum
    Commented Dec 2, 2014 at 1:29
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    @Richard later as in "alternate future timeframe" :P
    – Deltharis
    Commented Dec 2, 2014 at 1:32
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    In at least one TOS episode, McCoy makes the point that he outranks everyone else on the ship on medical matters - that he can remove anyone from duty/revoke their command authority if in his medical opinion they are medically unfit. Pretty sure that when Crusher flaunted her authority, it was predicated on the same idea.
    – Anthony X
    Commented Dec 2, 2014 at 2:29
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    @dmckee - and exactly what does the US Navy have to do with anything? USS happens to be the same designation as the USN uses, but is unrelated to the USA
    – Jon Story
    Commented Dec 2, 2014 at 10:56
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    @JonStory USN (as well as other navies, along with tales of tall ships) was used for much procedural inspiration. That's what USN has to do with it.
    – Smithers
    Commented Dec 2, 2014 at 18:49

5 Answers 5

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Beverly Crusher holds the rank of Commander as well as being the ship's Chief Medical Officer. She periodically acts as OOD (Officer of the Deck) on the night shift but remains outside the normal command hierarchy at other times.

In TNG : Gambit we see that that Enterprise' standard Bridge Command structure (based on who takes over as each senior officer leaves) goes Picard > Riker > Data > Worf > LaForge > Troi.

The positions of OOD, 1st Officer and 2nd Officer are not based on rank but are at the discretion of the Ship's Captain. In TNG : Best of Both Worlds (Part II), Captain Riker makes Lt. Commander Shelby his 1st Officer over Data, even though he acknowledges that this is an unusual act as it also results in Worf not moving up into the 2nd Officer position.

RIKER : Lieutenant Worf, everyone at this table shares my respect for your service to this ship. But right now, I need your experience at tactical... Mister Data, I realize that your very nature omits ambition. Nevertheless, I want you to know I thought seriously about you as First Officer as well...

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    I wonder if Riker's comment to Data in this episode is what created his sense of ambition that led him to confront Picard in Redemption part 2.
    – Plutor
    Commented Dec 2, 2014 at 11:51
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    @Plutor - Almost certainly.
    – Valorum
    Commented Dec 2, 2014 at 19:58
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Being the first or 2nd officer is not a rank - it's an occupation, distinguishing ships chain of command. So is being chief medical officer, like Beverly is. Military ranks are different, they work more or less independently, that is - to get an occupation you need required minimum rank and that's about it.

According to Memory Alpha referencing episode Thine Own Self Beverly Crusher is a Commander as opposed to Datas Lt. Commander and so she outranks him even though on the ships hierarchy they (kind of) do not fall within the same command chain.

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    "Being the first or 2nd officer is not a rank - it's an occupation" -> +1 for that. Along the same lines, Data is the 2nd officer, not LaForge, even though both happen to have the same rank (and, as of Generations, Worf, as well). Commented Dec 2, 2014 at 11:24
  • Reminds me of a Special Duty; all First Sergeants in the USAF are E7-E9, but not all E7-E9 are First Sergeants.
    – Smithers
    Commented Dec 2, 2014 at 18:51
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The hierarchy of ship operation is not tightly bound to any particular rank. Various positions have a minimum rank, but having the rank does not qualify an individual for that position. As a sweeping generalization the positions usually match the rank so there are no issues of a lower position having a higher rank and thus disagreeing about the orders (see #3 below).

Examples:

  1. Picard outranks Crusher, but he will never be the ship's doctor.

  2. Similarly, Crusher is not qualified to run the helm even though 'Ensign' is the minimum rank.

  3. Picard IS qualified to run the helm but if Picard has the helm, Data has the bridge, and the Romulans decide to visit, Worf would be in a very difficult situation if Data and Picard gave conflicting orders. Data has command of the bridge but Picard outranks Data.

  4. Most people would not place Worf in Troi's job, although I once read this about Klingon counsellors:

    I understand you have received news of your father's passing. Come - we will celebrate his death with wine and song!

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    In the third situation, Picard would be allowed as captain to relieve Data of the bridge in such occasion. Therefore this would never escalate into a problem.
    – Mast
    Commented Dec 2, 2014 at 8:50
  • @Mast quite correct, but if it's a time-critical situation they would not have enough time to resolve the hierarchy. That's why captains don't take the helm too often. I expect Worf would listen to Picard out of custom, but Data is rarely wrong.
    – paul
    Commented Dec 2, 2014 at 9:11
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    Wesley Crusher runs the helm despite not having the minimum rank of Ensign for several episodes.
    – Red_Shadow
    Commented Dec 2, 2014 at 13:49
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    @Red_Shadow: Wesley was given what amounts to a field commission. As far as the crew of the Enterprise was concerned, he's an ensign.
    – Ellesedil
    Commented Dec 2, 2014 at 14:46
  • @Red_Shadow - IIRC, he was an "Acting ensign", and in general an "acting" rank (in any situation, not just military) has the full authority of the position... it's just temporary.
    – Bobson
    Commented Dec 5, 2014 at 19:05
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There are a lot of really good answers already, focusing on the rank structure, how Crusher fits into it and highlighting that the role of Chief Medical Officer (CMO) is separate from rank. But not really covering why the CMO is special, so lets talk about that and clear up the differences between Crushers many Titles, Roles, Qualifications and Positions:

Commander Beverly Crusher MD

Qualifications and Professional Titles

Professional Title: Doctor

Doctor Crusher holds several medical qualifications, including a Doctorate of Medicine, granting her the professional title "Doctor" as well as the suffix "MD" refering to medical doctor. Of course someone with a Doctorate of Theoretical Physics (like Dr. Leah Brahms) would be a Doctor, but not a MD.

Starfleet Rank: Commander

Doctor Crusher also hold the military rank and title of Commander, reflecting a long 14 year career within Starfleet. On the Enterprise D this gives her joint second highest rank, shared with Commander Riker.

Career Path: Science and Medical

As depicted by her blue uniform, Crusher has followed a science/medical career path through Starfleet.

Job Title and Roles During her Tour on Enterprise D

Department: Medical, Role: Head of Department, Primary Job Role

Crusher's Starfleet rank qualifies her to perform all the roles and duties of a Department Head and her professional qualifications and long practicing experience make her ideal for heading the medical department.

Bridge Officer

Crusher is a fully certified "Bridge Officer" (similar to Officer on Deck, See Richard's and paul's answers) allowing her to act as the ship's commanding officer. While the Bridge Officers do appear to have an informally agreed structure, we can presume that those following the Command, Technical or Tactical career paths are more professionally qualified, but as a Commander she would have the military authority to pull rank on and give orders to almost anyone (save Riker and Picard).

Special Role: Chief Medical Officer

As the highest ranking medical officer onboard, Crusher is also granted the position of Chief Medical Officer (CMO). The CMO, similar to how the position/role of Captain is not the same as the rank of Captain, is a special role mandated by Starfleet for their vessels. The CMO has the authority to remove anyone from active duty if they are deemed, medically, to be unfit.

This is a separate power from her regular powers a Commander, it does not give her the power to promote or demote people above her station, but it does mean if the Captain goes mad there is someone on-board who, technically, can remove him from office and allow the next ranked officer to fill the role until starfleet assigns a replacement.

This role is as accountable to Starfleet as the Captain and is a bit of a double edged sword. Remove the Captain when it's unnecessary, or worse, fail to remove him when necessary and you could find yourself at a court martial. Also as this is technically a power outside of the normal rank structure the CMO would need support from key members of the crew (e. g. The Executive Officer (another special role), who is Commander Riker on the Enterprise).

The CMO position is not granted by rank nor by Primary Job Role. for example despite the fact that Voyagers EMH lacks a formal military rank, he is technically CMO as he is the only member of the crew left with high levels of medical training and, as a computer program, could be given formal officer training quickly.

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To correlate Navy terms, you can have a ship with an officer of the Medical Corp or the Supply Corp, etc. and have that officer even outrank the Commanding Officer by merit of rank, but the CO is a Line Officer and holds the title of CO so even if he is of a lower rank he would still hold lawful authority. Crusher is not a 'line officer' like Riker and Picard, she is a Medical officer so while her rank probably merits a higher pay and the privileges of being higher ranked (like saluting and boarding formalities), her title limits her scope of authority.

Example, An Admiral of the Dental Corp could not just walk on to a warship (starship) and take command just because the Commanding Officer is just a rank of Captain or Commander. However, that Admiral will get "ringed on" to announce his presence and he likely makes way more money than the CO.

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    I understand your references on pay based on rank, in order to refienforce your point. But, it should be noted that Starfleet officers don't get paid since money is almost entirely non-existent for Federation citizens.
    – Ellesedil
    Commented Dec 3, 2014 at 17:14

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