Rank advancement in the air force

I couldn't find the chart I was looking for that would explain rank progression better in the Air Force, but here it goes.......
New nurses w/ no RN experience start out as 2nd Lt
2nd Lt - 1Lt 2yrs
1Lt - Cpt 2yrs (4yrs total to Cpt)
Cpt - Maj 8-14yrs (about 10-14yrs total to Maj; currently it is a little longer for nurses)
Maj-LTC 5-7 yrs ( about 17 yrs total)
LTC-Col -3-5yrs (about 20-22yrs in the Air Force)

Not all the services promote on the same timeline. I know that the Army does promote a little faster.

Looks like I missed answering a couple of questions.....that is what happens when you only work night shifts every once in awhile.....lol....

We will probably be in Iraq enmass for atleast 3-5yrs w/ a small permanent presence for a very long time... The bonuses for nurses usually aren't variable once they're there they tend to stay there and when you consider how much some of the other specialities get Nurse Corps' is only a drop in the bucket.
As far as the need for Air Force nurses now and in the future......Well there was a lot of medical personell that enlisted after 9/11.....so there was not really a need to build up much....The AirForce is actually trying to thin out the ranks right now....mostly thru attrition....What does that mean for somebody wanting to come in.....not much...the AirForce is just not recruiting nurses as heavily... it is still needs lots of nurses....