Duty officer
The duty officer system is a game mechanic introduced to Holodeck with Season 5. There are over 36 thousand individual duty officers.

Once a Federation player reaches level 7 , the duty officer (not to be confused with bridge officers) system becomes available. Duty officers represent the junior officers, enlisted personnel, and civilian crew members of the player's starship. The mechanics of the system are rather similar to those of many collectible card games in that officers can be acquired from random booster packs purchasable on the C-Store. They can be slotted for bonuses, but not renamed or upgraded.


Players can make use of duty officers in four ways:-
-A player's starship has five slots for duty officers that enhance space operations and five slots for duty officers that enhance ground operations, depending on the officer's specialization.
-Duty officers can be sent out on special missions called assignments, which can reward skill points, bridge officer skill points, energy credits, temporary buffs, items, more duty officers, and experience toward commendations. These assignments can vary in real-time duration between 1 minute to 3 days.
-Duty Officers on your ship can build components and will offer assignments – some of these are new and some of these are additional chances to focus your efforts on a specific commendation category (e.g. Science, Engineering, or any other category).
-At the respective factions’ academies, Personnel Officers allow a captain to commission cadres of duty officers, and also to turn in five underperforming duty officers, plus a modest amount of Dilithium, for a random duty officer of the next highest quality.
Quality

This is indicated by the color of the duty officer's name and the border around the portrait, if there is one. Currently, there are duty officers of white, green, blue, and purple quality. Higher quality duty officers have a higher chance to complete assignments successfully, and will provide better assignment rewards than standard quality officers.

Rank

Duty officers, with the exception of civilians, will have an enlisted or officer rank. Some assignment slots may require duty officers of a particular rank.
Tactical/Security: Crewman, Ensign, Lieutenant Junior Grade, Lieutenant
Engineering/Operations: Crewman, Petty Officer, Chief Petty Officer, Master Chief Petty Officer
Science/Medical: Crewman, Specialist, Senior Specialist, Senior Chief Specialist
Klingon Defense Force: Bekk, Corporal, Sergeant, Lieutenant​
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Department​
Duty officers will be in one of the seven following departments: Tactical, Security, Engineering, Operations, Science, Medical, and Civilian. Some assignment slots require duty officers of a specific department, or the chances of the various outcomes may be modified by placing a duty officer of a specific department in a particular slot.
Specialization
This is the duty officer's primary role aboard the starship, such as Conn Officer, Security Officer, Astrometric Officer, etc. This defines what effect the officer has if assigned to a space or ground role. As with department, some assignment slots may require an officer with a specific specialization, or including an officer with a given specialization may modify the chances of the different outcomes.
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Traits​
Duty officers can have one or more traits. These are only important for assignments. Assignment slots indicate which traits will increase or decrease the chance of the possible outcomes of the assignment.
Overview
Conn Officer
Energy Weapons Officer
Ground Warfare Specialist
Projectile Weapons Officer
Shield Distribution Officer
Space Warfare Specialist
Armory Officer
Assault Squad Officer
Security Officer
Damage Control Engineer
Diagnostic Engineer
Fabrication Engineer
Maintenance Engineer
Matter-Antimatter Specialist
Systems Engineer
Technician
Warp Core Engineer
Deflector Officer
Explosives Expert
Flight Deck Officer
Hazard System Officer
Quartermaster
Sensors Officer
Tractor Beam Officer
Transporter Officer
Astrometrics Scientist
Biologist
Botanist
Development Lab Scientist
Geologist
Gravimetric Scientist
Photonic Studies Scientist
Research Lab Scientist
Warp Theorist
Biochemist
Counselor
Doctor
Medic
Nurse
Advisor
Bartender
Chef
Colonist
Diplomat
Entertainer
Prisoner
Refugee
Trader
Tactical department
Security department.
Engineering department
Science department
Operations department
Medical department
Civilian department
Obtaining Duty Officers
To begin or expand your captain's collection of Duty Officers there are several options available.
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Your first option is to requisition officers from the Personnel Officer at Starfleet Academy.
The Personnel Officer is located in center of the round building building in the North-West corner of the Starfleet Academy. Lt. Ferra, who has more information about Duty Officers, is also located here. The Personnel officer will offer up to five (5) assignments that each result in your captain gaining new crew members.
The assignments are:
General Recruitment
Tactical Officer Cadre​
Engineering Officer Cadre​
Science Officer Cadre
Civil Corps Recruitment
As can be expected, each of them results in a different type of officer gained. It should also be noted that these assignments take longer than most Doff assignments to complete. General Recruitment takes 20 hours of real time to finish and results in (). The other four assignments take 48 hours each and result in 2 random Duty Officers from within the appropriate fields being added to the duty roster. These are real-time hours that continue to count whether you are in the game or not and the officers gained are generally common, but can on occasion be more rare.
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The next option is very similar to option 1. At Starfleet Academy are 3 cross-cultural personnel officers. The Vulcan, Andorian and Tellarite peoples have each sent a representative to Starfleet Academy who can offer "Cultural Exchange" assignments that allow your captain to gain one Duty Officer from the appropriate race. These assignments take 20 hours to complete and result in a randomly selected officer. Again the officer will most likely be common, but other rarities can pop up.
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Third on the list, similar to options one and two, are assignments throuout the StarTrek Universe. Some of the assignments that you come across while performing the various missions offer additional personnel. Refugees, Colonists and Prisoners are the most common of these additions.
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Fourth on the list is to make use of the Exchange. Duty Officers are bought and sold on the exchange in large numbers. When a particular type is in high demand (often associated with starbase projects) the price of these Doffs can be quite high, making this a less reliable method of obtaining the duty officers you may want or need. Also on the exchange are Duty Officer Packs. These packs generally contain 4 random officers and can be themed, or standard. For instance, the Gamma Quadrant Duty Officer Pack.
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The fifth and final option is to purchase your Duty Officer Packs from the Zen Store. These packs are often bought and sold on the Exchange as well.
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Dismissing Duty Officers
If you wish to get rid of one or more of duty officers, you can just dismiss one and get an amount of Dilithium Ore and Recruitment CXP based upon their rarity.
Dismissing a Common: 1 Dilithium and 10 Recruitment XP
Dismissing an Uncommon: 10 Dilithium and 25 Recruitment XP
Dismissing a Rare: 25 Dilithium and 100 Recruitment XP
Dismissing a Very Rare: 50 Dilithium and 250 Recruitment XP.
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Another way to dispose of unwanted duty officers is to exchange either five low quality duty officers for one higher quality officer at the personal officers at the academy, or to exchange one high quality duty offier for three lower quality officers:

Reassign 5 Common for 1 Uncommon (costs 10 Dilithium ): 25 Recruitment XP
Reassign 5 Uncommon for 1 Rare (costs 50 Dilithium ): 100 Recruitment XP
Reassign 5 Rare for 1 Very Rare (costs 250 Dilithium ): 500 Recruitment XP
Exchanging an Uncommon for 3 Common: 50 Recruitment XP
Exchanging a Rare for 3 Uncommon: 150 Recruitment XP
Exchanging a Very Rare for 3 Rare: 300 Recruitment XP