World War One and World War Two are such enormous events which changed the world that really not knowing is amazing and sadly not teaching about them seems to be becoming more common so you aren't alone.
Most military have events which commemorate battles and those that were lost in these wars. Military training and the way wars were fought were changed by the First World War, foreign polices were defined by them as were policies in Germany which lead to the Second World War. These two wars are such history defining events that films and television dramas are still made about them, there are also dozens of documentaries about varying aspects of these wars.
It's never too late to catch up, learning stuff keeps the brain from getting old, ( or in my case older lol) I worry about Alzheimers so I devour learning anything like mad. Sadly anything mathematical still passes me by, I was taught well as a child but cannot do anything to do with numbers, I'm stuck without a calculator. The days here pre decimal money was a nightmare!
All my martial arts students have done a few tours in Afghan, two didn't come back. I'm no stranger to the place either.
Incidentally, James Cook was born not far from where I live and he moved as a child to even closer at Great Ayton.