FLASH OVERRIDE - A capability available to: E22.214.171.124.1. The President of the United States, Secretary of Defense, and Joint Chiefs of Staff. E126.96.36.199.2. Commanders of the Combatant Commands when declaring Defense Condition One or Defense Emergency. E188.8.131.52.3. Commander, U.S. Space Command, when declaring either Defense Condition One or Air Defense Emergency and other national authorities the President may authorize. Flash Override cannot be preempted in the DSN. E184.108.40.206.