In military organizations, an officer is a member of the service who holds a position of responsibility. Commissioned officers derive authority directly from a sovereign power and, as such, hold a commission charging them with the duties and responsibilities of a specific office or position. Commissioned officers are typically the only persons in a military able to exercise command (according to the most technical definition of the word) over a military unit. Non-commissioned officers in positions of authority can be sai ...

Including:

• Officer armed forces - Commissioned officers
• Officer armed forces - Subordinate officers
• Officer armed forces - Non-commissioned and warrant officers
• Officer armed forces - Officer ranks and accommodation

Read more here: » Officer armed forces: Encyclopedia - Officer armed forces

A non-commissioned officer is a military member holding a position of authority who has obtained it by promotion from within the enlisted ranks. They will have received some leadership training, but their function is to serve as leaders within their area of trade speciality and they are not generally considered management generalists. In some branches of some militaries there exists a third grade of officer known as a Warrant Officer. A Warrant Officer may be simply a high-ranking non-commissioned officer whose position has been affir ...

See also:

Officer armed forces, Officer armed forces - Commissioned officers, Officer armed forces - Subordinate officers, Officer armed forces - Non-commissioned and warrant officers, Officer armed forces - Officer ranks and accommodation

Read more here: » Officer armed forces: Encyclopedia II - Officer armed forces - Non-commissioned and warrant officers