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LM78L: Bipolar supply, diode protection?

Part Number: LM78L
I am working on a design that utilizes LM78L15 and LM79L15 to regulate +/-15VDC rails. I do not find any reference in either datasheet to the use of protection diodes for Reverse Polarity (Shunt diode to ground from output) and Reverse Bias (series diode from output to input). Are these devices still needed with the LM78L parts?