Joint Operation Planning and Execution System

Definition
The Joint Operation Planning and Execution System (JOPES) is

"[a] system of joint policies, procedures, and reporting structures, supported by communications and computer systems, that is used by the joint planning and execution community to monitor, plan, and execute mobilization, deployment, employment, sustainment, redeployment, and demobilization activities associated with joint operations."

Source

 * U.S. Department of Defense, Joint Pub. 1–02: DOD Dictionary of Military and Associated Terms (Apr. 2010) (full-text).