Black ops missions often fit into the plausible deniability category, in which there is no claim of responsibility for the action, and/or a false flag operation is used to give the appearance that another actor was responsible, or – most often – black operations involve extensive arrangements so as to be able to hide the fact that the black operation ever occurred. Black military operations, or paramilitary operations, can be used by various secret services to achieve or attempt to achieve an unusually sensitive goal. The methods used in black operations are also used in unconventional warfare.