Book excerpt: Army Doctrine Reference Publication (ADRP) 7-0, Training Units and Developing Leaders, augments fundamental principles discussed in Army Doctrine Publication (ADP) 7-0, Training Units and Developing Leaders. Both ADP 7-0 and ADRP 7-0 support the doctrine established in ADP 3-0 and ADRP 3-0. Army units will face a complex operational environment shaped by a wide range of threats, allies, and populations. Rapid advances in communications, weapons, transportation, information technologies, and space-based capabilities make it a challenge to just stay even with the pace of change. Because Army units face a wide mix of challenges-from strategic to tactical-they must develop leaders to conduct unified land operations anywhere in the world in any operation across the conflict continuum. Army training prepares units and leaders to be successful through challenging, realistic, and relevant unit training and leader development at home station, at the combat training centers, and in the schoolhouses.