5-26. The application of the tenets of unified land operations—simultaneity, depth, synchronization, and flexibility—is foundational to the conduct of operations. These four tenets should inform both plans and the conduct of operations. Army forces are most successful when they synchronize and converge effects across the breadth and depth of their assigned AOs within the scope of their mission. Large-scale combat operations require higher echelon headquarters to empower tactical organizations to make decisions and act, and higher echelon headquarters enable lower echelons within their capabilities. As an example, there are national-level space and cyberspace capabilities that can engage specific target sets to support tactical engagements. Commanders and staffs understand, plan for, and request effects available from these national level assets in much the same way they do joint fires. For tactical commands to successfully orche strate the various domains and functions, planners must not assume higher-level effects are beyond their scope. However, such requests must generally be made in advance of combat operations, and the execution and results of such requests may not always be known to the commander on the ground.