A Cold War fear of germ warfare created the world's most famous corps of outbreak investigators. Alexander Langmuir's Epidemic Intelligence Service championed shoe-leather epidemiology, cracked the 1955 Cutter polio-vaccine disaster, and became a model copied worldwide. It is real power, but the kind that finds the truth and advises rather than commands.
Counts of EIS officers vary by source. Historians also debate how central biological-warfare fears were versus their usefulness in selling a peacetime corps, and Langmuir institutionalized surveillance rather than inventing it.