author
A clear, concise look at the U.S. Army’s place in American history, from its Revolutionary War roots to its role as a modern military force. It offers a straightforward introduction for listeners curious about how the Army developed and why it matters.

by United States. Army
This title appears to be about the United States Army, not a single identifiable person. Because of that, there is no individual author biography I can confirm from the information I found.
Reliable sources describe the U.S. Army as the primary land-based branch of the United States Armed Forces, with origins in the Continental Army formed during the American Revolutionary War and a formal establishment dating to 1784. Official Army history materials also present its story as a long institutional history shaped by wars, expansion, and changing national priorities.
If you meant a specific author connected to a book titled United States. Army, I can create a proper author overview once you share the author’s name or the exact edition.