If a sitting US President flew on a spacecraft operated by the US Space Force, would the spacecraft's call sign be Space Force One, analogous to Air Force One, Marine One, etc.?
What if he flew on a private spacecraft? "Executive One" like a private plane?
What about a NASA spacecraft?
This FAA doc for air traffic control processes on page 2-4-9 says
When the President is aboard a military aircraft, state the name of the military service, followed by the word “One.”
And followed by a subset of examples.
Note however this is an FAA document so would only rule for air traffic control*. The actual ground and space activities would have titles and callsigns resolved when it became relevant - e.g. the US Navy does not change the name of ships carrying the president, and Secret Service callsigns while working on foot are not fixed. The choice would probably depend on the political objective in having a president in the craft in the first place - certainly a contrived photo op with a vehicle on the ground to achieve first use of "Space Force One" seems sadly plausible.
*Most space flight to date has been air-traffic controlled via exclusion zone rather than direct control, it being not very useful to have a controller trying to put a space shuttle in holding pattern, or change ascent trajectory.
In the air traffic control system, call signs (especially for commercial airliners) are temporarily assigned based on function (the flight it's on). And gives a bit of information to the controllers about the flight. Since there's already a lot of procedures in place for call sign management, this is just one additional piece.
The whole history of the President's plane being assigned a special sign is due to an incident where the plane's call sign conflicted with that of another flight.
There is no space traffic control center (certainly not one that is using voice communication for real-time interaction), and there is no procedural system in place that assigns and uses call signs to deconflict communications. Piloted launch vehicles do not communicate with ATC or use ATC callsigns during the mission. It is still a rare occurrence today for communication to take place with multiple piloted space vehicles, and never is this happening without lots of planning.
Someday in the future where the president's spacecraft might show up without someone expecting it, and if we're using voice communications to do spacecraft traffic control, this might be a good idea.
No official call signs have been established for a US President flying on a spacecraft operated by the US Space Force or NASA. However, if a sitting US President were to fly on a spacecraft operated by the US Space Force, it's possible that the spacecraft could be referred to as "Space Force One". If he were to fly on a private spacecraft, it's possible it could be referred to as "Executive One". However, these are just potential names and not official call signs.
