POTUS EO Options To Recall Retired Military Back Into Active Duty Under US Code, Title 10, sections 688-690, Presidential EO 13223 restablishes proceedures to recall retired military Ready Reserve back into service if needed. This is not the recall, just a preparation. https://www.whitehouse.gov/presidential-actions/presidential-executive-order-amending-executive-order-13223/ https://www.law.cornell.edu/uscode/text/10/688 This would not apply to medically retired/discharged or military veterans who served, yet didn't retire.