There are three types of omissions:

Omit an initial article except when it constitutes the first element of a geographic or personal name (AACR2 24.5A1). Example:

Omit phrases citing an honor or order awarded to the body (AACR2 24.5B1). Example:

Omit terms of incorporation when they are not needed to indicate that the name represents a corporate body (AACR2 24.4C1-C2). Example:

See also:

18.6. Omissions and additions (qualifiers)