The reason you were offered FPS rather than IE is because you are either: (1) a re-enrollee with previous Reg F experience; or (2) you were >35 yrs old when you enrolled which means you would not be able to complete a 20 yr IE before CRA (still age 55 for those who enrolled before July 2004).
The re-enrollee scenario is due to some legal technicality of the CF Superannuation Act. Read it if you have insomnia:
http://laws.justice.gc.ca/en/C-17/index.html. Much better explanation for the layman (laysoldier?) is in the booklet "Your Pension Plan and Release Pay Benefits":
http://www.dnd.ca/admfincs/dappp/handbook_e.asp. Every soldier should read this booklet!!!
If you are a re-enrollee with previous Reg F time - the end of your FPS should be the point you will have 20 cumulative years of Reg F service. If it is the age thing the FPS will expire on your 55th birthday. Simple? nuh-uh!
Good news: Pension Modernization makes all this complex bullshit go away finalement:
http://www.forces.gc.ca/dgcb/dpsp/engraph/modernization_e.asp?sidesection=5&sidecat=17. Pension benefits will be based on cumulative years of service PERIOD.
If someone out there is on a FPS and is considering requesting an IPS (yes, I said "requesting" - IPS will NOT be offered - read on for reason...) keep in mind that there are currently very nasty penalties (5% for every year short of 24 yrs + 1 day) and that for FPS/IPS folks these *&#! penalties apply to your ENTIRE PENSION!!!!!!! Relax IE/IPS people - you have penalties too but you have "IE Protection" - your pension will not dip below the 40% earned at end of IE. In fact, despite the percentage of a percentage penalties mentioned above - your pension is actually growing between 20 and 24 years + 1 day. The penalties are just slowing the growth of your pension.
The only drawback to the new pension is that the IE is 25 years. No immediate unreduced annuity until you have 25 years of service! That is why there was a big push to get folks signed up to IE 20. If you are on IE 20 or FPS 20 or IPS you have no worries mate. If you are on a BE or SE (for officers) you might want to rattle your boss' cage and take a look at DMCARM 7337. I couldn't find a link but the text is here in CFSU Ottawa's ROs:
http://www.cfsuo.forces.gc.ca/csss/ro/ro2004/01prt2_e.asp. Get your bad self on an IE toute suite mon ami. I am looking forward to hitting my 20 years of service in a little under two years and will have FREEDOM to choose at that point. Right now they have me by the short hairs. I will go where they want, when they want 'cause I want/need the pension baby. I will probably continue to go where "they" want after I have 20 because I LOVE IT - but that will be my call. FREEDOM BABY!