Yes, he is no9t the boss of president, it is other way around, and if he disobeys, he is subject to court-martial.
TRUMP PREPARED – SPECIAL OPERATIONS NOW REPORT DIRECTLY TO SECRETARY OF DEFENSE
https://themarshallreport.wordpress.com/2020/11/21/trump-prepared-special-operations-now-report-directly-to-secretary-of-defense
Trump fired Secretary of Defense Mark Esper on November 9, 2020 and appointed Christopher Miller to take his place, then continued moving special forces and chains of command to respond in alignment to a wartime agenda.
Milley’s only hope is kiss up to Obama oops Biden’s power cirlce.
He should resign.