"Guideline" is the NATO reporting name for the Soviet SA-2 surface-to-air missile.

A guideline is a statement by which to determine a course of action. A guideline aims to streamline particular processes according to a set routine or sound practice. By definition, following a guideline is never mandatory. Guidelines are not binding and are not enforced. ( U.S. Dept. of Veterans Affairs, http://www.va.gov/trm/TRMGlossaryPage.asp )