1-71. Training is the most important thing the Army does to prepare for operations. It is the cornerstone of combat readiness and the foundation for successful operations. Effective training must be commander driven, rigorous, realistic, and to the standard and under the conditions that units expect to operate in during combat. Realistic training with limited time and resources demands that commanders focus their unit training efforts to maximize repetitions under varying conditions to build proficiency. Units execute effective individual and collective training based on the Army’s principles of training as described in ADP 7-0. Through training and leader development, units achieve the tactical and technical competence that builds confidence and allows them to conduct successful operations across the competition continuum. Achieving this competence requires specific, dedicated training on offensive, defensive, and stability or defense support of civil authorities (DSCA) tasks. Training continues in deployed units to sustain skills and to adapt to changes in an operational environment. (See ADP 7-0 for training doctrine.)