May all Active Duty and Retired members of all the Uniformed Services fly Space-A?

Yes. All Active Duty and Retired members (as well as their eligible family members) of all seven uniformed services (U.S. Army, U.S. Navy, U.S. Marine Corps, U.S. Coast Guard, U.S. Public Health Service Officer Corps, National Oceanic and Atmospheric Administration Officer Corps and U.S. Air Force) may fly Space-A as provided for in DoD 4515.13 as revised.