Which of the following is NOT a guideline for political activities by armed forces members?

The correct choice is based on the guidelines governing political activities for armed forces members. Members of the military are indeed allowed to express their personal political views on public issues, provided it does not imply endorsement by the Marine Corps. Additionally, it's important to avoid any actions that could be interpreted as the Marine Corps endorsing a political position, especially online.

Regarding the choice about turning on GPS on personal devices, this option does not relate to political activities or guidelines set forth for military personnel. Instead, the focus is on ensuring that service members maintain professionalism and avoid situations that could compromise the integrity of the organization. Guidelines emphasize the importance of personal conduct in relation to political expression, not the technical aspects of device settings used for communication.

Thus, the guideline that suggests turning on GPS has no relevance to political participation and is therefore the correct choice as it does not pertain to the established protocols for political activities among armed forces members.