I always advise young pups just starting their AF careers to keep logbooks, but not only for "the interview" one day down the road.
Anyone who's lost a bro in a mishap or flown with a guy who's flown West knows how cool it is to have a record of your flights with them. I've got cable arrestments at alert sites, pond crossings watching the Hale Bopp comet, and approaches to minimums (again and again) from flying in Germany. Since I don't keep a journal, my old logbook is the closest thing to a memory chest I have. Also fun to see former students and where they end up. I've solo'd more than a few who have gone on to FWIC (or WIC these days...) or the F-22, and flown with dozens of guys who are now around the globe in a lot of different places. Several of my former students are now at FDX with me. I'd have forgotten the details...but I have the log entry and the mission info saved for posterity. So--in addition to helping accuracy--its a fine trip down memory lane when you want one.
And yeah...as an interview coach...its nice when clients have some raw material to work with. Your day to day missions may be the same--I just put down the crew names in those. By the trips that stand out usually get a remark or two. It takes a few extra minutes a month...but when I look back its always worth the effort.