I am sorry about being a pest, but these heros are becoming more rare and lots of knowledge is lost. Maybe you have, but if you have not you should sit down with him and gather as much info as possible. Some more questions from me.
1. What were the main operational maintenance issues with the P-51.
2. Was there any concern about the Germans because of their Dec offensive. He must have arrived just as the tide was turning. Asche appears to only be about 100 miles from Bastogne.
3. What was his opinion of command in the ETO? What were some of the dumbest procedures?
4. Did he fly any escort missions? If so, what did he think of them?
5. What did he like about the Mustang and its cockpit? What bothered him?
6. What was his opinion of the gunsight? How did he feel about the effectiveness of the 50 cal.? Was there problems with jamming?