Long time lurker delurking here
Nords has a great post on this - I was active duty for 3 years 9 months and then left to pursue a graduate degeree and civilian career - along the way got hit by the ER bug, but throughout it all have maintained my Reserve status and am just now finishing a 3.5 year active duty stint in Europe - an opportunity I would have had a very low probability to have with my civilian career.
ER can come from several streams of income with different ones streaming at different times of your life---I'm 40 now but am looking to ER in 5-10 years. And the way I look at it, I will be able to use a bit larger SWR if necessary during the 15-10 year range until the Reserve pension kicks in at 60.
Right now I see people around me who have had at times a very busy 20 years, but will be leaving with a COLA'd pension and close to free medical care and if they'd been prudent in their fiscal habits could have a very nice lifestyle - explaining that to them is sometimes difficult
Smartest people I know are the ones who came in at 17/18 enlisted, got their degrees then became officers and are retiring at 38-40 with an officer's pension----and then the world is their oyster--plus they tend to be better adjusted people having worked their way up understanding all the roles in the organization.
Enough rambling - I think the Reserves is great and am so glad I didn't opt out - good luckwith your decision and welcome to the ER wannabe and are crowd - it's great to see all these examples out here and they are more than willing to let you know how to do it ;-) their way, of course.......I just take that which works for me.
Deserat