Final answer:
The question pertains to the specific commands for an Extended Rectangular PT formation in the military, but the provided references do not detail these commands. Additional official military information would be needed to answer accurately.
Step-by-step explanation:
The Extended Rectangular PT (Physical Training) formation commands in a military context are used to organize troops for physical training. These commands are part of a larger set of drill commands and may vary by military organization. However, based on the reference provided, these commands are not detailed in the given information.
The reference to Sun Tzu relates to ancient military strategy rather than physical training formations. Further information from an official military training manual or doctrine would be required to provide the eight specific commands for the formation in question.
Nevertheless, the reference provided emphasizes the importance of soldiers following the directions of the movement and the captain on a demonstration, which may relate to being flexible and adaptable in tactics as part of military training and operations.