I am not sure why they would do that unless they never want to be a pilot.
Big Blue is pretty clear on the fact that if you turn it down you will NEVER be able to reapply for rated again.
If you get any of the other three, basically you have the chance, to apply for UPT later on.
~ IE CSO.
~~ UNT is 10 months, add on another year to get through SERE, water survival, and airframe training. 2 years operational.
That puts you at 26/27. Chances of graduating at the top of your UPT class are very high. Higher than right out of the gate. Every Strike Eagle WSO I know that strained, got either a Strike or a 16. UPT was also easier for them because they know how to study the BOLD, how to brief, mission plan and once selected for UPT, most pilots in the squadron would hand over the stick for them to practice whenever possible
Additionally, nobody knows if those that went down this path did so because their career desire or not physically qualified for pilot. Many go CSO because they do not meet the FC1 physical for vision, but do for CSO.