The job title of this position is SIGINT Informaticist, which apparently is a type of Signals Analyst. The hiring process is quite slow and takes one or more months to cross every step. Other past interview postings will provide you the basics and I won't repeat them here. The 1:1 interview lasted about 45 minutes. I was not asked for transcripts, recommendations, or letters of recommendation. I'll list below the questions that you can expect to be asked for this position. During the interview, you can be misled into thinking that they are interested in you, but unless they give you explicit and immediate feedback to this effect, I would assume otherwise. My impression is that it is quite competitive.
Flex hours and a casual dress code were mentioned. After two years of work, you have some freedom of alternating time with education, though I wouldn't risk asking about this particular possibility. This is because they might like for you to stay on the job rather than take paid time off for further education.
For your own safety, you want to assume that all your telephone calls are carefully monitored while you are undergoing job processing. There is no hard evidence that I have to indicate that this actually happens, but it would be foolish to assume the opposite.