Answer:
A commanding tone.
Step-by-step explanation:
In the given excerpt from Executive Order No. 9066, President Roosevelt gave an order that commanded and authorized the various departments and agencies to give assistance to the Secretary of War and other Military Commanders. It gave the order to help them out in "furnishing medical aid, hospitalization, food, clothing, transportation, use of the land, shelter, and other supplies, equipment, utilities, facilities, and services".
Through the order coming from him being the highest in command over them all, the President used a commanding tone to make sure that help and assistance were provided to the necessary individuals. And the tone can be best understood and identified by the use of the word "authorize" which in a way, can be taken as someone who gave permission to do something to another person, signifying his greater power over the other.