From the above posted calculator link.
FUTURE ARMED FORCES PENSION SCHEME – ACCRUED RIGHTS
2012DIN01-063 outlined the pension rights in AFPS 75 and AFPS 05 that will have been accrued prior to the introduction of the new AFPS from 2015. As a result the forecasts provided by this calculator are no longer complete projections of future entitlement beyond 2015. The calculator will still provide a general guide to benefit entitlement for those due to retire before 2015 and those who are covered by the additional transitional protection outlined in the DIN (ie those who are born on or before 1 April 1967 for regular forces). Details of the new AFPS are being developed and additional information will be promulgated in due course. A revised Pensions Calculator, incorporating both accrued rights and benefit entitlements under the new scheme, will be developed once the final design of the new scheme is agreed. On current planning assumptions it is anticipated a revised calculator will be on line from April 2013.
So not really much use for those staying after 2015!