I suggest you contact the National Museum of the Marine Corps
They have an awesome collection of history of the Marines in China. I especially liked the exhibit of Sgt Major Dan Daly on the Peking Wall.
The Sand Pebbles is a must see for History buffs, it has a hidden message of how people learn that was insightful for me as a teacher.
A life well lived is a adventure every day!
Semper Fi to your Grandfather!