I would also suggest going to the Combat Studies Institute and CGSC Press page

There are a number of books and papers that speak to adaptation, transformation, and learning. For starters look at:

Leavenworth Paper (LP) No. 1: The Evolution of U.S. Army Tactical Doctrine, 1946-76, Major Robert A. Doughty. (HTML) (PDF)

LP No. 4: The Dynamics of Doctrine: The Changes in German Tactical Doctrine During The First World War, Timothy T. Lupfer. (HTML) (PDF)

LP No. 12: Seek, Strike, and Destroy: U.S. Army Tank Destroyer Doctrine in World War II, Dr. Christopher R. Gabel. (PDF)

LP No. 16: Deciding What Has To Be Done: General William E. Depuy and the 1976 Edition of FM 100-5, Operations, Major Paul H. Herbert. (HTML) (PDF)

Research Survey (RS) No. 5: Standing Fast. German Defensive Doctrine on the Russian Front During World War II: Prewar to March 1943, Major Timothy A. Wray. (HTML) (PDF)

RS No. 6: A Historical Perspective on Light Infantry, Major Scott R. McMichael. (PDF)

CSI Report (CSIR) No. 1: The Evolution of the Tank in the US Army, 1919-1940, LTC Kenneth M. Steadman. (HTML)

CSIR No. 8: Discussions on Training and Employing Light Infantry, MAJ Scott R. McMichael. (HTML) (PDF)

CSIR No. 14: Sixty Years of Reorganizing for Combat: A Historical Trend Analysis, CSI Faculty. (HTML) (PDF)

Secret of Future Victories, Paul F. Gorman, General, U.S. Army, Retired. (HTML)

Watershed at Leavenworth- Dwight D. Eisenhower and the Command and General Staff College, MAJ Mark C. Bender. (HTML)

In Tribute to General William E. DePuy, Generals Thurman, Talbott, & Gorman. (HTML) (PDF)

Center for Military History U.S. Army GHQ Maneuvers of 1941.

Understanding the "victory disease" from the Little Bighorn to Mogadishu and beyond, Timothy Karcher. Paper #3. (PDF)