MCO 5216.21 governs Marine Corps policies and procedures for processing joint actions and coordinating Service positions.
View MCO 5216.21 on armypubs.army.mil
It covers joint action receipt, coordination, response development, correspondence formats, and processing systems. It also establishes requirements for Marine Corps participation in Joint Chiefs of Staff, Operations Deputies, and Deputy Operations Deputies meetings.
Applies to: This Order is applicable to the Marine Corps Total Force.
The JACO will initially receive all joint actions. (paragraph 2-1)
Preliminary coordination does not constitute a USMC position. (paragraph 2)
Final coordination is normally accomplished by a Marine Corps Service Planner and provides formal concurrence or nonconcurrence. (paragraph 2)
Responses require Marine Corps Service Planner's approval prior to submission to the Joint Staff. (paragraph 6)
The JSAP Form-136 is the formal tasking form from the Joint Staff and is required for Service action to take place. (paragraph 8)