I believe this is an attempt to control the hemorrhaging. Seems that across the ranks when guys are nearing the 20yr retirement zone they are more prone to cut sling load and begin a new track. I know that currently 180As that have been hitting that zone tend to be CW2s and end up leaving instead of pushing for CW3. This has been creating a huge deficiency and retention gap in the CW3-CW4 zone.
Same can be seen for the E-8s waiting to hit E-9, been witnessing a lot of those guys jumping ship lately. I think they are just getting fed up playing the waiting game.
At this current point and time, that is a lot of experience walking out the door. It will be interesting to how this impacts retention issues for 180As.