Question

In 1947, Congress created the United States Air Force even though the Constitution makes no mention of an air force. Why was Congress able to do this?

Answer 1

The Army, Navy, and Air Force are comprehended in the constitutional term "armies." Article I, 8, provides that Congress may "raise and support Armies," and "provide and maintain a Navy," and make "Rules for the Government and Regulation of the land and naval Forces."