Do you have any recommended reading for Junior Enlisted personnel?

If you can find them some of the old F M 25's

The Mission, The Men, and Me. By Pete Blaber.

The military is like a cold shower, somebody should tell you about it before you get in. Long title short book. Old, might still be available on Amazon.

Starship Troopers - Robert Heinlein.

You already covered Covey and the 7 Habits, I would throw in Leadership Wisdom of Jesus Christ, Blunders in International Business, Road to Serfdom, Military Incompetence-How and why some operations failed.

Robert Kiyosaki books ~ starting with Rich Dad Poor Dad ~ Napoleon Hill (Author of Think and Grow Rich)

Five Years to Freedom: The True Story of a Vietnam POW, James N. Rowe
The Speed of Trust, Stephen R. Covey
First Break All the Rules: What the World’s Greatest Manager Do Differently, Marcus Buckingham & Curt Coffman
How to Win Friends & Influence People, Dale Carnegie
The 7 Habits of Highly Effective People, Stephen R. Covey
Man’s Search for Meaning, Viktor Frankel
Good to Great: Why Some Companies Make the Leap…and Others Don’t, Jim Collins
The Compound Effect, Darren Hardy

Anything with the following subject:
Strategic Management

Anything by the following author:
John Maxwell

Textbook:
Leadership: Theory and Practice, Peter G. Northouse

Search Google Scholar for peer reviewed articles that research topics regarding leadership

I am old fashioned. I recommend reading up on the Principles of War. All these principles can be applied by small units to the Nation.

Sun-Tzu: Art of War

I'm recommend "Start with Why: How Great Leaders Inspire Everyone to Take Action", "Leaders Eat Last: Why Some Teams Pull Together and Others Don’t" both by Simon Sinek and The Constitution of the United States. I chose both books from Simon Sinek, because after reading these I started expecting more from my leadership and holding them accountable to their responsibilities and even curved my leadership style a bit and it helped me immensely. We all swore to support and defend the Constitution of the United States, so it might to helpfully to know exactly what we are defending.