yes. all officers can be recalled into service at anytime and be court martialed for insubordination. the only way for him to achieve protection would be to resign officer's commission, though that would be nearly impossible as he's already retired and that in and of itself is considered the commission being retired. then he would have to somehow cancel and stop his retirement payments. prez biden can reinstate him, then he can resign his commission, not refile for retirement payment and be scot free.
United States