3-16. To conduct sustainment in unified land operations, sustainment planners must fully understand the operations process—planning, preparing, executing, and continuously assessing the operation; operational art and mission command (see ADP 5-0, ADP 3-0, and ADP 6-0, respectively). Additionally, sustainment planners must understand the mechanics of joint operations and the necessary links that ensure strategic level support. (See JP 3.0, JP 4.0, and JP 5.0.)