In March we were told 137 at ye2014 and retirement of 27/yr thereafter. The math on that equates to ye2019 for the last retirement. But other folks have mentioned 2018.

Supposedly, from a GS instructor, they committed to purchase 89 fuel kits for an AD req'd by 2018 (iirc) so it would seem that quite a few will still be in service for a while after that.