I learned in tech school on the F100-220 and the F100-100.  That's good you help out, I'm sure it makes all the crew chiefs and engine guys you work with pretty happy.  I have heard the F119 is a blast to work on, no safety wire or anything.  We have F110-100's here at Aviano.  I wanted Avionics originally, but couldn't book a slot when I came in.  I'm happy with my career choice though.  Maybe some day I'll be a Chief in a props flight or AMU  I guess it doesn't hurt to shoot for that haha.