That's the death rate that can be clearly and unambiguously tied to something that happened during a test. The problem is that deaths due to radiation exposure

That's the death rate that can be clearly and unambiguously tied to something that happened during a test. The problem is that deaths due to radiation exposure can take place years or decades after that exposure, and the data needed to clearly connect the two is often classified, lost, or was never gathered in the first place. At best, you'll uncover a statistical correlation (e.g., the ten cases of leukemia recorded in later years among the troops who were present at the Smokey shot, where only four would be statistically expected). Having said that, I suspect that the number of folks who died as a direct result of exposure during tests that they participated in was relatively small, particularly compared to what happened to the folks who lived downwind of the NTS during the atmospheric-testing era. The troops in the Desert Rock exercises were in and out in hours -- but the downwinders lived in fallout contaminated areas for extended periods of time, ate food raised on or grown in contaminated soil, etc. And then there's the cast and crew of The Conquerer...