UK Army Brat here, all my life we moved around, sometimes with the regiment, sometimes without and I spent a bit of time at a couple boarding schools too. I think it has made me a fairly sociable and independent person as you have to learn to just cope with a whole new social circle and get on with people all the time (I may have ended up like that anyway though, who is to know?) Also the whole living in different countries I think has given me a half decent world view and respect for other people’s cultures.
I did find with school that at one school I would do well in a subject and at another I would not do so well and I always put that down to how well I clicked or did not click with the individual teachers.
One thing I have missed is the fact that my memory of my childhood is pretty hazy, I couldn’t tell you who my best friend was when I was 10 for example, or the name of any of my friends when I was 10 or what they even looked like, whereas some of my friends now have all known each other since primary school and that constant contact has seemed to keep those memories alive for them.
As far as joining the Army? Well, growing up with it was enough to make me realise that there is no soldier in me ( I like my guts where they are !! ) but my older brother joined the Army Air Corps so things were obviously different for him.