Which of the following are considered combined commands?

The correct choice for identifying combined commands is the selection that includes "Fall In," "At Ease," and "Dismissed." Combined commands are those that consist of both a preparatory command and a command of execution.

In this context, "Fall In" acts as a preparatory command that instructs personnel to assemble, followed by "At Ease" which allows them to relax in position once they are formed. "Dismissed" functions as a command of execution that signifies the end of formation.

The other options lack this combination of preparatory and execution commands. For example, "At Ease," "Attention," and "Dismissed" do not create a coherent combination of commands that require both preparation and execution in the same context. Understanding these distinctions is crucial to effective command in military settings, as it helps ensure clarity and proper response among personnel.