An anthropologist friend of mine has worked on many assignments over the years, but his most interesting project qualifiedtest pilots for the Air Force.
In order to advance in rank or earn a specific qualification insignia such as lead the watch team in the reactor plant, a qualification board is organized with a sailors superiors and qualified peers to test his or her knowledge.
And while you didn't exactly have to be a rocket scientist to join the original space missions (the U.S. Mercury and Apollo programs recruited many test pilots), if you want to stand a chance against other heavily-qualified applicants, it's certainly an advantage.
The more detailed analysis, using data from the Labour Force Survey, eliminates households who have already qualified for benefits and so would not be affected by removing the "right to reside" test.