Final answer:
Involuntary assignments to a second food service attendant tour in the military generally require authorization from higher-level command such as a Commanding Officer or Department Head, subject to specific military branch and unit regulations.
Step-by-step explanation:
The assignment of a second involuntary food service attendant tour for service members is a decision that typically requires authorization from a specific level of command within the military structure. While the specific individual authorized to approve such assignments can vary by branch and unit, generally, higher-level commanders such as a Commanding Officer or Department Head could potentially be vested with the authority to make these decisions. Invoking this sort of assignment would be unusual and likely require a compelling reason, as involuntary assignments can affect moral and retention.