During the Cold War, more than 2,300 non-combatant conscientious objectors from the Seventh-day Adventist church volunteered to serve their country by participating in U. S. Army medical experiments focused on developing defensive medical countermeasures against the Soviet Union’s bio-warfare capabilities. These volunteers were exposed to experimental vaccines and infectious pathogens. Operation Whitecoat tells the story of these patriots–their commitment to both their religious principles and desire to serve in America’s defense, their courage to participate in these tests, and their contributions that went far beyond Army biodefense.