There is an old thread in this forum called "Loko Busters" - just follow the link. Maybe you'll find some interesting information there.
Your father was with the 79-th FS./20-th FG. and as per this good site he flew a P-51D s/n 44-15431, coded MC-K, named Oscillatin' Oscar - you already have this information from the American Air Museum in Britain. I'm just adding it to make it understandable for the rest of the forum members.