Mine I got when I bought the special edition of Fallout: Tactics, back in the days before Steam. Well, about 15 years ago. There were a bunch of gifs that came on the CD. I just loved the Brotherhood full power armor design, and by the point in the game where you can walk around like that carrying a minigun it just feels so fucking boss.
Yes, Tactics is my favorite Fallout game. Maybe because it was the first one I really got into, but I still look at it today as simply the best era in turn-based combat, before things got really simple. The story really kept it up through the whole thing too, every new area was some kind of revelation or introduction to something crazy - a new species, a new run down facility, a faction of psychos, or just scary as fuck mutants.
But enough about the game. I've had this avatar since I joined here, it's a little pixel-y because of the size limit. It doesn't really represent me all that much, other than the fact that the Brotherhood is my favorite faction in the Fallout games. Maybe has something to do with my weird phobia of electricity becoming non-existent one day, and the fact that I always think about what it would be in an apocalypse - I always run scenarios through my mind what life would be like without it.