18A ODA turn over rate

[engineered2win]

Hi, I've been on this site for a few weeks and just finished GET SELECTED! and I have a few questions.

I understand that the turn over rate for 18A's on an ODA is between 1-3 years, with 3 years being extremely rare. It seems that you will spend as much time in the special forces pipeline as you will operating on an actual team. From what I've gathered if you want to be on an ODA you want to be an NCO, and if you want to be an officer that is a different career path.

1) Why is this so short?
2) Where do you typically go after being on an ODA? The turnover rate seems too high for everyone to be promoted to staff. In a company with 6 ODAs there would be an average of one new officer ever 4 months (assuming 24 month cycle).
3) In retrospect, would any of you 18A's have rather been a NCO than an officer so you could spend more time on a team?

Thanks in advance.