(Via Ralph William Shields — email him if you’d like to get his TBI news updates): DoD doctors say that the number of U.S. troops who have suffered wartime brain injuries may be as high as 360,000. This is a substantial jump from the Rand Corporation’s 320,000 guesstimate from last year. We’ll likely never have an accurate number.

The DoD doctors now estimate that 45,000 to 90,000 troops have suffered “more severe and lasting symptoms” from TBI; this is substantially fewer than the up-to-150,000-suffering estimate given by “neurologists affiliated with the U.S. Military” in 2007.