In the United States Navy, commissioned officers are either line officer

Line officer

In the United States armed forces, the term line officer or officer of the line refers to an officer who is trained for command — that is, to be the commanding officer of a warship, ground combat unit, combat aviation unit, or combat support unit....

s or staff corps officers. Those of the Staff Corps are specialists in career fields which are professions unto themselves, such as scientists, physicians, lawyers, civil engineers, etc. Staff Corps officers wear their specialty insignia on the sleeve of the dress blue uniforms and on their shoulder boards, in place of the star worn by Line officers. On Winter Blue and khaki uniforms, the specialty insignia is a collar device worn on the left collar, while the rank device

United States Navy officer rank insignia

In the United States Navy, officers have various ranks. Equivalency between services is by pay grade.-Rank categories:In the U.S. Navy, pay grades for officers are:...

 is worn on the right.

Staff Corps
Name	Medical Corps Navy Medical Corps The Medical Corps of the United States Navy is a staff corps consisting of military physicians in a variety of specialties. It is the senior corps among all staff corps, second in precedence only to line officers...	Dental Corps Navy Dental Corps The Dental Corps of the United States Navy consists of naval officers who have a Doctorate in either Dental Surgery or Dental Medicine and who practice dentistry caring for sailors and marines. In overseas locations they also treat dependent family members...	Nurse Corps	Medical Service Corps Navy Medical Service Corps The Medical Service Corps is a staff corps of the United States Navy, consisting of officers engaged in medical support duties. It includes healthcare scientists and researchers, comprising around 60% of its personnel, and healthcare administrators, comprising the remaining 40%...	Chaplain Corps (Christian)
Designator†	210X	220X	290X	230X	410X
Insignia

Name	Chaplain Corps (Jewish)	Chaplain Corps (Muslim)	Supply Corps	Civil Engineer Corps Civil Engineer Corps The Civil Engineer Corps is a staff corps of the United States Navy. CEC officers are professional engineers and architects, acquisitions specialists and Seabee Combat Warfare Officers. They are responsible for executing and managing the planning, design, acquisition, construction, operation, and...	Judge Advocate General's Corps Judge Advocate General's Corps, U.S. Navy The Judge Advocate General's Corps also known as the "JAG Corps" or "JAG" is the legal arm of the United States Navy. Today, the corps consists of a worldwide organization of more than 730 Judge Advocates, 30 limited duty officers , 500 enlisted members and nearly 275 civilian personnel, serving...
Designator†	410X	410X	310X	510X	250X
Insignia
†An officer designator describes their general community or profession. The (fourth) digit (X) denotes the whether the officer has a Regular (0), Reserve (5), or Full Time Support (7) commission.

Staff corps officers are specialists in certain areas, such as supply and medicine. They wear staff corps insignia. A doctor can become the commanding officer (CO) of a hospital or a medical school or the chief of the Bureau of Medicine. A supply officer can become the CO of a supply depot or a school or the head of the Navy Supply Systems Command. When officers are of the same grade and date of commissioning, but from different officer’s categories, seniority takes precedence in the following order:

1. Line
2. Medical
3. Supply
4. Chaplain
5. Civil Engineer
6. Judge Advocate General
7. Dental
8. Medical Service
9. Nurse.

In addition to regular commissioned officers, the Navy has another group of officers called commissioned warrant officers.

See also

• List of Naval Officer Designators
• United States Navy officer rank insignia
  United States Navy officer rank insignia
  In the United States Navy, officers have various ranks. Equivalency between services is by pay grade.-Rank categories:In the U.S. Navy, pay grades for officers are:...
  
  
• Uniforms of the United States Navy
  Uniforms of the United States Navy
  This article examines dress uniforms, daily service uniforms, working uniforms, special situations, and the history of uniforms of the United States Navy...
  
  
• Badges of the United States Navy
  Badges of the United States Navy
  Insignia and badges of the United States Navy are military "badges" issued by the United States Department of the Navy to naval service members who achieve certain qualifications and accomplishments while serving on both active and reserve duty in the United States Navy...
  
  
• U.S. Navy midshipman rank insignia can be found in the midshipman article.
• U.S. Navy warrant officer rank insignia can be found in the warrant officer (United States)
  Warrant Officer (United States)
  In the United States military, the rank of warrant officer is rated as an officer above the senior-most enlisted ranks, as well as officer cadets and candidates, but below the officer grade of O-1...
  
   article.
• List of United States Navy enlisted warfare designations
• United States Navy enlisted rate insignia
  United States Navy enlisted rate insignia
  A United States Navy enlisted rate indicates where an enlisted sailor stands within the chain of command, and also defines one's pay grade. An enlisted sailor's rate is similar conceptually to a naval officer's rank. The word rate refers to an enlisted sailor's pay grade, while the word rating...
  
  
• List of United States Navy ratings
• Navy Enlisted Classification
  Navy Enlisted Classification
  The Navy Enlisted Classification system supplements the rating designators for enlisted members of the United States Navy. A naval rating and NEC designator are similar to the Military Occupational Specialty designators used in the U.S. Army and U.S. Marine Corps and the Air Force Specialty Code ...