I can’t say I have strong recollections of any of them. I have a vague recollection of the flight to basic training (first time flying, but mostly I remember there was a drunk dude sitting next to me,) but I don’t recall anything from my first day in the military proper. No first days of school or on any job have stuck.

I guess my clearest memory is for the most recent major first — first day living in Bangalore, India (a little over eleven years ago.) I must say, however, I just remember snippets of being lost in a walk around the neighborhood. One might expect a first day in urban India to be daunting / overwhelming- even for a reasonably well-traveled Westerner, but if it was I don’t remember that bit.