The following table lists the ranks and insignia of officers in NATO air forces.
The first warrant officer rank, WO1 does not have a "commission" associated with it, instead having a "warrant" from the secretary of the army.
Warrant officers are allowed the same courtesies as a commissioned officer, but may have some restrictions on their duties that are reserved for commissioned officers.
Warrant officers usually receive a commission once they are promoted to chief warrant officer 2 (CW2/CWO2).
WO1s may be appointed by commission as stated in title 10 USC.