TPW
For examples of people doing the job at the moment have a look at
Test Pilot Tuesday - YouTube
As well as thinking about what they have to say look at their ages and their obvious quality as people.
I think we can be pretty sure they did not get where they are by saying
I ask because I don't want to go the military route (I actually did, briefly! I went to the US Air Force Academy but in the end decided it wasn't for me).