Executive officer

executivefirst officerXObusiness executiveexecutivesbusiness executivesexecutive officersexecfirst lieutenantCommander
An executive officer (CCE) is generally a person responsible for running an organization, although the exact nature of the role varies depending on the organization.wikipedia
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Commanding officer

COCommanding Generalmilitary commander
In many militaries, an executive officer, or "XO," is the second-in-command, reporting to the commanding officer. In the units of some military forces, typically those that are naval in nature (including the U.S. Marine Corps), the executive officer is the second-in-command, reporting to the commanding officer (CO).
The commanding officer is often assisted by an executive officer (XO) or second-in-command (2i/c), who handles personnel and day-to-day matters, and a senior enlisted advisor.

Chief executive officer

CEOmanaging directorchief executive
In business, the executive officers are the top officers of a corporation, the chief executive officer (CEO) being the best-known type.
The chief executive officer (CEO), or just chief executive (CE), is the most senior corporate, executive, or administrative officer in charge of managing an organization especially an independent legal entity such as a company or nonprofit institution.

Second-in-command

second in command2ICjunior
In the units of some military forces, typically those that are naval in nature (including the U.S. Marine Corps), the executive officer is the second-in-command, reporting to the commanding officer (CO).
The equivalent appointment in the United States Army is the executive officer.

First lieutenant

lieutenant1st Lieutenant1st Lt.
In smaller vessels, such as submarines and frigates, the executive officer also holds the position of first lieutenant. On small ships with no first lieutenant, gunnery officer, or navigator, the executive officer may also be responsible for the duties of those officers.
In minor war vessels, destroyers, frigates, and submarines, the first lieutenant is second in command, executive officer (XO) and head of the executive branch; in larger ships where a commander of the warfare specialization is appointed as the executive officer, a first lieutenant is appointed as his deputy.

Battalion

battalionsinfantry battalionbattalion commander
There are executive officer slots in each company, battalion, regiment, and brigade, though generally not at higher levels of command until the army level.
A US Army battalion includes the battalion commander (lieutenant colonel), executive officer (major), command sergeant major (CSM), headquarters staff, and usually three to five companies, with a total of 300 to 1,200 soldiers.

Company (military unit)

companycompaniesrifle companies
There are executive officer slots in each company, battalion, regiment, and brigade, though generally not at higher levels of command until the army level.
Unlike its component platoons, a company typically has additional positions of supporting staff, such as an executive officer (XO), a first sergeant, a readiness/training NCO, and other positions (e.g., supply sergeant, armorer).

Gunnery officer

gunneryGunnery Department
On small ships with no first lieutenant, gunnery officer, or navigator, the executive officer may also be responsible for the duties of those officers.
The gunnery officer was usually the line officer next in rank to the executive officer.

Brigade

brigadesbrigade commanderinfantry brigade
There are executive officer slots in each company, battalion, regiment, and brigade, though generally not at higher levels of command until the army level.
a brigade executive officer, usually a lieutenant colonel (if commanded by a colonel)

Colonel (United States)

ColonelCol.Col
These latter terms were previously used for similar positions at the group and wing level until renamed as the "operations group commander (OG/CC). The rank of an executive officer in the U.S. Air Force can vary from lieutenant or captain working for a colonel, to a major or lieutenant colonel in support of a brigadier general or major general, to a colonel serving as the executive officer to the Chief of Staff of the Air Force.
An Army colonel typically commands brigade-sized units (4,000 to 6,000 soldiers), with another colonel or a lieutenant colonel as deputy commander, a major as executive officer, and a command sergeant major as a senior non-commissioned officer (NCO) advisor.

United States Naval Aviator

naval aviatoraviatorNaval Aviators
Unlike their U.S. Navy counterparts, XOs of U.S. Marine Corps squadrons in U.S. Naval Aviation do not "fleet up" to become CO.
Unlike other branches of the Navy, a squadron commanding officer (CO) starts out as executive officer (XO), then "fleets up" to the CO position during his or her tenure.

Lieutenant

Lt.LtTenente
These latter terms were previously used for similar positions at the group and wing level until renamed as the "operations group commander (OG/CC). The rank of an executive officer in the U.S. Air Force can vary from lieutenant or captain working for a colonel, to a major or lieutenant colonel in support of a brigadier general or major general, to a colonel serving as the executive officer to the Chief of Staff of the Air Force.
In minor war vessels, destroyers and frigates the first lieutenant (either a lieutenant or lieutenant-commander) is second in command, executive officer (XO) and head of the executive branch; in larger ships where a commander of the warfare specialisation is appointed as the executive officer, a first lieutenant (normally a lieutenant-commander) is appointed as his deputy.

Organization

organisationorganizationsorganisations
An executive officer (CCE) is generally a person responsible for running an organization, although the exact nature of the role varies depending on the organization.

Executive (government)

executiveexecutive branchexecutive power
While there is no clear line between executive or principal and inferior officers, principal officers are high-level officials in the executive branch of U.S. government such as department heads of independent agencies.

Humphrey's Executor v. United States

Humphrey's Executor v. United States, 295 U.S. 602
In Humphrey's Executor v. United States, 295 U.S. 602 (1935), the Court distinguished between executive officers and quasi-legislative or quasi-judicial officers by stating that the former serve at the pleasure of the president and may be removed at his discretion.

President of the United States

PresidentU.S. Presidentpresidential
In Humphrey's Executor v. United States, 295 U.S. 602 (1935), the Court distinguished between executive officers and quasi-legislative or quasi-judicial officers by stating that the former serve at the pleasure of the president and may be removed at his discretion.

Federal Trade Commission

FTCFederal Trade Commission (FTC)U.S. Federal Trade Commission
The decision by the Court was that the Federal Trade Commission was a quasi-legislative body because of other powers it had, and therefore, the president could not fire an FTC member for political reasons.

Bowsher v. Synar

Congress can’t retain removal power over officials with executive function (Bowsher v. Synar). However, statutes can restrict removal if not purely executive (Humphrey’s executor), but can't restrict removal of purely executive officer (Myers v. United States, 272 U.S. 52 (1926)).

Myers v. United States

Congress can’t retain removal power over officials with executive function (Bowsher v. Synar). However, statutes can restrict removal if not purely executive (Humphrey’s executor), but can't restrict removal of purely executive officer (Myers v. United States, 272 U.S. 52 (1926)).

Business

for-profitenterprisefirm
In business, the executive officers are the top officers of a corporation, the chief executive officer (CEO) being the best-known type.

Board of directors

board of trusteesdirectorboard
The definition varies; for instance, the California Corporate Disclosure Act defines "executive officers" as the five most highly compensated officers not also sitting on the board of directors.

Sole proprietorship

sole proprietorsole traderproprietorship
In the case of a sole proprietorship, an executive officer is the sole proprietor.

Partnership

partnerpartnershipspartners
In the case of a partnership, an executive officer is a managing partner, senior partner, or administrative partner.

Limited liability company

LLClimited liability companieslimited liability corporation
In the case of a limited liability company, an executive officer is any member, manager, or officer.

Charity (practice)

charitycharitablecharitable work
In charity/voluntary sector/non-profit, the executive officer(s) are those appointed to drive the day-to-day decisions of the organization.