Final answer:
The appendix related to NVDs in AR 600-55 is not specified, but AR 600-55 typically includes standards and training for the use of night vision devices in military vehicle operations.
Step-by-step explanation:
The appendix that covers NVDs (Mandatory Academic and Driving Tasks for Night Visions Devices) in Army Regulation 600-55 is not clearly specified within the context of the question. However, Army Regulation 600-55, which is relevant to Army driver and operator standards, may include guidelines and training procedures for the use of night vision devices (NVDs) as they pertain to operation of military vehicles and equipment.
Given that the question seems to pertain to a specific appendix within a military regulation, the detailed information on NVDs required academic and driving tasks would typically be found within that regulation document. It should be noted that Figure 6.14.4, mentioned in the question, shows night vision goggles which are essential for understanding how night vision technology is used in military operations.