2-21. The Army’s capability and capacity to conduct large-scale ground combat is unique and foundational to its other roles. Only the Army has the capabilities necessary for sustained ground combat anywhere in the world. The credibility inherent in its ability to conduct large-scale ground combat as part of the joint force is a critical part of U.S. conventional deterrence. It is a primary source of assurance to friendly nations and an important factor in worldwide stability. The U.S. Army conducts large-scale ground combat as part of the joint force. When it deploys and fights, the Army both enables and is enabled by the other Services when they perform their roles. An Army that can defeat any enemy worldwide requires professionally committed leadership, well-equipped and trained units, and proficiency in the conduct of joint and multinational operations. Maintaining the readiness necessary for large-scale ground combat is a difficult and continual process that consumes significant time and resources. Readiness for large-scale ground combat operations saves lives.