Executive Order 10501: Safeguarding Official Information in the Interests of the Defense of the United States [open pdf - 616KB]
Alternate Title: EO 10501: Safeguarding Official Information in the Interests of the Defense of the United States
"Official information which requires protection in the interests of national defense shall be limited to three categories of classification, which in descending order of importance shall carry one of the following designations: Top Secret, Secret, or Confidential. No other designation shall be used to classify defense information, including military information, as requiring protection in the interests of national defense, except as expressly provided by statute.' Executive Order No. 10290 of September 24, 1951 is revoked as of the effective date of this order."
Executive Order 10501; EO 10501
Code of Federal Regulations
3 CFR, 1949-53 Comp., p.979-986