What does command authority not include in terms of operational responsibilities?

The correct choice highlights that command authority does not encompass the ability to make binding contracts for the US government. In a military context, command authority primarily involves the power to organize, manage, and employ forces effectively to achieve mission objectives. This encompasses activities such as overseeing contractor performance and directing personnel actions to ensure that the units operate as required.

However, making binding contracts is a distinct function that requires legal authority and capabilities typically vested in procurement officials and contracting officers, rather than commanders. Command authority is focused on operational leadership and the tactical execution of missions, while contracting authority lies outside this scope, emphasizing contracts' legal and financial implications. Hence, the lack of inclusion of making binding contracts within command authority aligns with the responsibilities typically assigned to other specialties within military operations.