What is a Commanding Officer (CO) in the Navy?

A Commanding Officer (CO) is the person the Navy holds responsible for a unit’s mission, people, and standards. That unit can be a ship, submarine, aviation squadron, shore command, or specialized team.

This guide explains what a CO is, what a CO actually does each day, and how officers usually reach command. It is written for officer candidates and junior officers who want a clear picture of the job.

What you will learn:

• What “Commanding Officer” means in the Navy
• What a CO is responsible for, and what they can delegate
• How the CO works with the XO and senior enlisted leaders
• The difference between CO, “captain,” and “commander”

What is a Commanding Officer (CO)?

A Commanding Officer is the commissioned officer placed in command of a Navy unit. The CO has the authority to direct the unit and the accountability for how it performs.

The Navy’s baseline expectations for command responsibility are described in U.S. Navy Regulations, Chapter 8. Those rules apply across platforms, even though day-to-day life looks different on a ship, in a squadron, or at a shore activity.

Where COs serve

CO is a billet, not one specific job. A CO may command:

• A ship or submarine
• An aviation squadron or detachment
• A shore installation or operational unit
• A specialized unit (for example, some expeditionary or special operations units)

A broader view of ship roles and how they connect is in Naval Officer Roles Aboard U.S. Navy Ships.

What a Commanding Officer is responsible for

COs do not “manage fleets.” They command one unit and make decisions inside higher orders, policy, and law. The job is broad because it blends operations, people, and accountability.

Most CO responsibilities fit into a few buckets:

• Mission execution: Set priorities, accept risk when appropriate, and ensure the unit can do the job it is assigned.
• Readiness: Drive training, maintenance, inspections, and qualifications so the unit is prepared to deploy and operate safely.
• People: Protect safety and welfare, develop leaders, and build a command climate that supports performance.
• Discipline and standards: Enforce good order and discipline and keep standards consistent.
• Resources and administration: Approve major plans, manage limited time and funding, and ensure required reporting is accurate.

On ships, the day-to-day structure that supports these responsibilities is described in the Navy’s Standard Organization and Regulations Manual (SORM).

Authority and accountability (what a CO can delegate)

COs can delegate tasks and authority. They cannot delegate responsibility for the command.

In plain terms:

• A CO can assign work to the XO, department heads, and division officers.
• A CO can publish standing orders and set decision rules for routine situations.
• A CO is still the person held accountable when the unit succeeds or fails.

COs also carry legal authority in specific areas. For example, COs may impose nonjudicial punishment under Article 15 within the limits of the law and policy.

The command team: CO, XO, and senior enlisted leaders

Good commands are not run by one person. The CO leads, but the CO depends on a team to keep the unit stable and ready.

On many units, the CO works closely with:

• Executive Officer (XO): The XO runs day-to-day execution and drives systems, follow-through, and standards. This role is covered in What is an Executive Officer (XO) in the Navy?
• Senior enlisted leader: On ships this is often the Command Master Chief (CMC) or Chief of the Boat (COB). This leader helps set enlisted standards and connects the CO to deckplate reality.
• Department heads and chiefs: They run major parts of the unit, train teams, and keep programs healthy.
• Division officers (DIVOs): DIVOs manage smaller teams and handle daily leadership reps. This role is covered in What is a Division Officer (DIVO) in the Navy?

The CO sets priorities. The XO turns priorities into a plan. Chiefs and DIVOs turn the plan into daily performance.

CO, “captain,” and “commander” (common confusion)

Three words cause confusion in the Navy: commanding officer, captain, and commander.

• Commanding Officer (CO) is a position. It means you are in command of a unit.
• Captain can be a rank (O-6). It can also be the traditional way people address the CO of a ship, even if the CO’s rank is lower.
• Commander can be a rank (O-5). It can also mean “the commander” of a larger formation, like a strike group.

In short, CO is about who has command. Rank is about paygrade. The Navy often uses traditional terms in daily speech, especially at sea.

A rank refresher is in the Navy officer rank structure.

How officers become Commanding Officers

Becoming a CO is a long path. The details depend on your community (surface, submarine, aviation, special warfare, staff corps), but the pattern is similar.

Most officers move through steps like these:

1. Commission: Through the Naval Academy, NROTC, OCS, or another path to becoming a Navy officer.
2. Qualify and perform: Earn the community qualifications expected for your first tours.
3. Lead at increasing scale: Division officer jobs lead to larger leadership roles, often followed by department head tours.
4. Serve as XO or equivalent: Many COs serve as an XO before they take command.
5. Screen for command: Communities use screening and selection processes to decide who is ready for command responsibility.

The Navy places heavy weight on sustained performance, judgment, and trust. A CO is expected to make hard calls with incomplete information and still protect safety and mission readiness.

Physical readiness and personal standards

There is no special fitness test for COs, but COs are expected to meet Navy standards and model professionalism. That includes staying medically ready and meeting requirements under the Navy’s Physical Readiness Program.

COs are also held to high personal conduct standards because their choices can affect the whole command. Leadership credibility is part of operational readiness.

Challenges and rewards

Command is demanding because the CO does not get to opt out of responsibility. The work includes operational planning, administration, inspections, personnel issues, and constant risk decisions.

The reward is influence. COs can set a culture that protects people, improves performance, and develops the next generation of leaders. When a command is healthy, the mission runs better and the crew feels it.

Frequently Asked Questions (FAQ)

Can a junior officer be a Commanding Officer?

Sometimes, but it depends on the unit. Smaller units may have command billets at lower paygrades, and some units use an Officer in Charge (OIC) billet instead of a CO billet. The responsibilities can still be serious, even when the title is different.

Is the CO always the most senior person on board?

Usually, yes. Some ships may have embarked senior leaders or staff, but the CO still retains command authority for the ship and crew unless higher authority formally changes the command relationship.

Is the CO role only for warfare communities?

No. Staff corps officers can command certain units, especially shore commands tied to their specialties. The exact path depends on the community and the type of command.

Closing thoughts

The Commanding Officer is the Navy’s final decision maker at the unit level. The job is not about having the loudest voice or the most authority. It is about building readiness, making disciplined decisions, and taking responsibility for outcomes.

If you want to pursue command someday, focus early on performance, trust, and the ability to lead people under pressure. Those habits matter long before anyone hands you a guidon or puts you in the captain’s chair.