Which major system incorporates the Joint Operation Planning and Execution System (JOPES)?

The Joint Operation Planning and Execution System (JOPES) is primarily incorporated within the Global Command and Control System (GCCS). This system serves as a critical framework for U.S. military planning and execution processes, enabling effective command and control during operations. The GCCS integrates various tools and systems to facilitate the comprehensive management of operations, including planning, execution, and assessment components essential for joint operations.

In this context, JOPES provides the necessary planning and execution capabilities for the military's joint force across various theaters, which ACE integrates with the broader command and control functions of the GCCS. This system ensures that all operational planning aligns with strategic goals, utilizing data that informs decision-making at all levels of military operations. Thus, identifying GCCS as the correct answer highlights the significance of this system in coordinating and executing military plans effectively.