Yep, this. They can promise anything they want up front, but they still need to take their tests, get the results back, choose a "dream sheet" of jobs they qualify for, then they have to hear back about whatever job they actually get. And then they leave. It does happen over the course of several months, up to a year. And then they don't even know their duty station until a week before they leave tech school, and they don't know their tech school location until a week before BMT ends. We are AF, too.
Giving vibes, though! It's a hectic and stressing process when you don't know what is going on. More so when you want to plan EVERYTHING...like me. And you just can't.