The President and Secretary of Defense have directed the Department of Defense (DOD) to transform in order to meet an uncertain future and the unfolding challenges of the 21st Century domestic and international security environments. As the Armed Forces of the United States transform, they must develop a common frame of reference to define and develop future joint force concepts, capabilities, requirements, and Service-provided forces. The existing frames of reference for the joint force are joint doctrine and Joint Vision. Joint doctrine only provides a common frame of reference for the current joint force. It does not, however, address the development or experimentation of future concepts and capabilities that could improve joint force operations. The Joint Vision provides a broad future vision and construct for military transformation. However, it contains little actionable detail for joint force planning and development. Joint doctrine and Joint Vision together will provide a baseline to help focus the development and comparative analysis of emerging concepts, capabilities, requirements, and Service-provided forces that will be employed within future joint warfare and crisis resolution. At the focal point of US military transformation and implementation is the Joint Requirements Oversight Council (JROC). The role of the JROC has evolved from a strictly materiel focus to a strategic integration role in the coevolution of joint doctrine, organization, training, materiel, leadership and education, personnel, and facilities (DOTMLPF) critical force considerations. As the crossroads for joint vision related requirements generation and development, the JROC currently must evaluate concepts, capabilities, architectures and requirements from each Service. What is missing for the JROC's use is a common perspective on joint warfare and crisis resolution in the 21st Century from which the JROC can review, integrate and compare emerging joint concepts, capabilities, architecture and requirements. To provide the missing common joint perspective for the JROC and address the Chairman's future joint vision in actionable detail, the Joint Staff's Directorate for Operational Plans and Joint Force Development (J-7) has worked on a JROC-sponsored project in collaboration with the Services, combatant commands, Joint Staff and defense agencies to develop An Evolving Joint Perspective: US Joint Warfare and Crisis Resolution In the 21st Century. This document provides a common joint warfighting perspective intended to identify and describe the key elements and desired capabilities that comprise the evolving and emerging American way of joint warfare and crisis resolution for the foreseeable future. This joint perspective grows from an understanding of the current environment, focuses on Joint Vision as the azimuth, and serves as the foundation for transformation. It captures and defines emerging consensus on the desired shifts in the characteristics and conduct of joint warfare and crisis resolution as well as the evolving joint fundamentals that will help to achieve the desired goals of military transformation. It provides an essential complement to Service transformation and warfighting perspectives and an integrating context for joint concept and architecture development, the Requirements Generation System (RGS), and Force Planning and development efforts.