How many roles can one person take on as a remote pilot in command or visual observer?

The concept of roles for a remote pilot in command (PIC) and visual observer (VO) within the context of unmanned aircraft operations is defined by regulatory standards and best practices in aviation. According to those standards, one person can serve in only one role at a time during flight operations—either as the pilot in command or as a visual observer. This is crucial for maintaining safety and ensuring proper mission oversight.

When one person attempts to take on multiple roles simultaneously, it complicates communication and situational awareness, which can lead to unsafe conditions. For example, the PIC is responsible for the entire operation and must maintain control of the aircraft, while the VO assists by keeping an eye on the aircraft's surroundings to help avoid collisions. If one individual tries to perform both roles, it becomes difficult to focus adequately on the tasks required for either position.

In summary, the only valid conclusion in this context is that one person cannot effectively fulfill the roles of both a remote pilot in command and a visual observer at the same time. Thus, the answer reflects the regulatory framework and the emphasis on safety within unmanned aircraft operations.