The introduction begins, "Between 1908 and 1946, the United States established fourteen schools at home and abroad specifically to train Americans to speak Japanese. The motivation was always to prepare for war with Japan, but for a while, war was only a distant cloud."
It seems well written and useful, with a lot of research. I doubt it will make its way into academic or intellectual circles, but it should. Too bad it's relatively obscure.
The only site that has info about it is at the 6th Marine Division:
What steps did the United States take in the 1940s to defeat their enemy in the Pacific? Read Kanji & Codes - Learning Japanese for World War II for some insights...American Japanese language schools date back to 1908, but the real push came from dedicated Army, Navy and Marine Corps officers who set up more schools in 1941, and against all odds, succeeded in training the men and women who help to win the war and go on to make a huge contribution in winning the peace with Japan.
Well, at least you heard about it here, too.
By the way, here's some info about the 6th Marine Division:
Our 6th Division was the final Marine Division to be formed during WWII. They would be the only Division formed overseas, fight overseas, and disband overseas...The Division was born in September 1944 on the Island of Guadalcanal. There we trained until sailing to Okinawa, which would be the Divisions first and also the last battle that the Division would be involved in.