You are required to update your Course Planner if you change your home school or degree plan. You can update your Course Planner if your courses are in the Pending status.
In order to avoid having to resubmit your Course Planner multiple times, you should include all courses that you know are needed to complete your degree, but you must complete 50 percent in order to submit your Course Planner for approval.
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Army Education Centers
How to use Course Planner