Final answer:
TM 9-1410-1600-12 is a technical manual that specifies the checking frequency of humidity indicators on stored GMs, but the exact frequency is not provided without access to the manual. It typically varies with the missile type, storage conditions, and environmental factors.
Step-by-step explanation:
According to TM 9-1410-1600-12, which is a technical manual for military systems, the humidity indicators on stored Guided Missiles (GMs) should be checked on a regular schedule. While this manual may have specific guidelines, without access to the actual content of TM 9-1410-1600-12, it is not possible to provide an exact frequency for these checks. Generally, the frequency can vary based on factors such as the missile type, storage conditions, and environmental factors. Maintenance personnel responsible for the care of these systems are typically required to follow detailed schedules and procedures as outlined in the official technical documentation.