I still have my first model. That is important to me because of who gave it to me.
I have a special affection for Skyhawks. Even the versions I didn't serve with, I seem to want to keep the old models forever. My first two Skyhawk models were Airfix kits of the A4D-1. One lives on in my case as the first USMC Skyhawk unit.
I have a large collection of 1/72 scale Yellow Gear, and some figures that would work with them. I plan to put them around the aircraft shelves, with the figures painted up as different people I remember from my old days, one of Anne, my Brother and Uncles, etc.
For some reason, I can't get rid of my first attempt at a 1/72 FJ-2 Fury, even though it didn't turn out very well compared to most "online model photo builds." I don't know why I keep it, lol. I have a Revell F-4 kit converted into the 6th F4H-1 (before they were F4H-1Fs),,,,,,again, it has its warts, but, it is like an old friend.
cool thread, looking forward to reading more answers
Rex