VMS Help CMS, SET, ACL, Qualifiers, /DELETE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Indicates that the access control entries (ACEs) specified with
    the /ACL qualifier are to be deleted. If no ACEs are specified
    with the /ACL qualifier, the entire ACL is deleted. If the /ACL
    qualifier specifies an ACE that does not exist in the ACL of the
    specified object, you are notified that the ACE does not exist,
    and the delete operation continues on to the next ACE on the ACL,
    if any exists.