The two men allegedly conspired to recruit and lead an expeditionary mercenary force — made up of D.C.'s unhoused population — to overthrow the island.
Justices were skeptical Monday that the case was an exception to other lawsuits against defense contractors, which usually get immunity in such litigation.
The last Air Force vice chief, Gen. Jim Slife, was fired by President Trump in February without explanation as part of a broader purge of military leaders.