In very large part this is true.Most folks are unaware that because of the absence of sealift, transports from the US were reserved for tanks, artillery,ammunition. While jeeps and deuce and a halfs were manufactured under license in Japan by Toyota, Honda and Nissan. Facilities were modernized and Detroit methods were employed. All of which in a sfew year began to turn out Datsuns and Toyotas for Japan and later the world.
My dad worked for the US Army’s Japan Procurement Agency and we lived in Japan in the 1950s when I was a little kid.
Dad told the story about how representatives of Isuzu called on JPA buyers, asking to build something—anything, to get the company back on its feet.
The JPA guys turned over a “brand new” 1949 Dodge Duce & 1/2 to Isuzu and said if they could build them, the Army would buy them.
Isuzu copied every nut and bolt on the Duce and for several decades, “Japanese Dodges” were part of the Army fleet. They were still running when we left the Philippines and were left behind in Viet Nam.
Until just a few years ago, Isuzu told this story on its website, crediting a handful of unnamed DACs at Japan Procurement Agency for the survival of the firm.