My grandmother, Della Kurtz Shaffner, had 3 sons in the South Pacific at one time. She saved every letter they wrote home.
Walter was the oldest son and was killed in action in 1944
Don, my father, served with the 163rd Infantry, which was a National Guard unit from Montana that was activated. He mostly served in the New Guinea theatre of action and was often a clerk since he could type. He told stories of flying over "the hump" with a bag of money to pay the soldiers.
Dean, the youngest, served with the Headquarter unit under General McArther.
I have a scrapbook of information that I just briefly went through. (more to scan) Of course, my dad kept a scrapbook!