This handbook is designed to help combatant commanders, subordinate joint force commanders, and functional or Service component commanders implement the Joint Mission Essential Task List (JMETL) process described in CJCSI 3500.01, Joint Training Policy for the Armed Forces of the United States. Definition of Joint Training. Joint training is military training based on joint doctrine designed to prepare joint forces and/or joint staffs to respond to operational requirements identified by joint force commanders. Joint training generally involves the performance of tasks by members or elements...