What did the declassified documents reveal?

Communists Prepare to Expand Korean Air War – an intelligence memorandum from the Central Intelligence Agency dated October thirty‑first, nineteen‑fifty‑one. The document is notable because it records an early U.S. assessment of Chinese Communist air activity and the prospect of expanded operations from Korean airfields during the Korean conflict. The memorandum was declassified and made publicly available through The Black Vault. The release was approved for public dissemination on February sixth, two thousand nine, under the authority of the CIA’s declassification office. The full text can be accessed at the archive link provided by The Black Vault. Intelligence Memorandum Subject: Communists Prepare to Expand Korean Air War A number of events during the past month have signaled a long‑anticipated Communist effort further to extend air operations over North Korea. The movement of Communist air units into Manchuria, the recent increase in numbers of enemy jet interceptors operating in Korea, and the intensive preparations to ready Korean airfields point to the imminence of a new phase in Communist air operations in the Korean war. Communist jet interceptor aircraft appeared in the Korean war approximately a year ago with the ostensible purpose of defending the Yalu River against anticipated United Nations air strikes into Manchuria. Meanwhile, a program of rapid training and equipping of Chinese Communist air units was initiated. The increase in both personnel and aircraft since the initial engagements were fought over the Yalu has resulted in a definite numerical superiority over comparable United Nations air strength in the theater. With the attainment of this superiority, it is possible that the Communists have now embarked on a new aerial phase of the Korean war in which the enemy’s considerable potential will be used offensively. Prior to beginning extensive air operations from Korean fields, the Communists were faced with the problem of United Nations detection and destruction of their air facilities before they became operational. Early Communist efforts to rehabilitate airfields followed no discernible geographic pattern, and they emphasized camouflage rather than local anti‑aircraft defenses for protection. The recent Communist effort to put airfields into operation has followed a logical, well‑conceived plan which has greatly enhanced the possibilities of its success. The positioning of new fields well within the defensive radius of Manchurian‑based jet interceptors, as well as the concentration of both heavy and light anti‑aircraft weapons at the fields, was calculated to give these embryonic air bases a maximum chance for survival. The degree of success achieved by the Communists to date is illustrated by a twenty‑third October United Nations medium bomber raid on the airfield under construction at Namsi. An estimated one hundred and forty Communist jet interceptors destroyed three of the attacking B‑two‑nine aircraft and severely…

Why was this case declassified?

This material entered the public record through the U.S. declassification and Freedom of Information Act (FOIA) process. The originating source document is linked on this page so the citation chain is auditable.

CIA Communists Prepare To Expand Korean Air War – An Intelligence Memorandum

◆ BLUF — The short version

Communists Prepare to Expand Korean Air War – an intelligence memorandum from the Central Intelligence Agency dated October thirty‑first, nineteen‑fifty‑one. S. assessment of Chinese Communist air activity and the prospect of expanded operations from Korean airfields during the Korean conflict.

Date: OCT 17 · 2026
Release: Declassified · U.S. public record (FOIA)
Source document: View the primary source document

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Communists Prepare to Expand Korean Air War – an intelligence memorandum from the Central Intelligence Agency dated October thirty‑first, nineteen‑fifty‑one. The document is notable because it records an early U.S. assessment of Chinese Communist air activity and the prospect of expanded operations…

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Questions about this case

What was CIA Communists Prepare To Expand Korean Air War – An Intelligence Memorandum about?: Communists Prepare to Expand Korean Air War – an intelligence memorandum from the Central Intelligence Agency dated October thirty‑first, nineteen‑fifty‑one. S. assessment of Chinese Communist air activity and the prospect of expanded operations from Korean airfields during the Korean conflict.
Why was this case declassified?: This material entered the public record through the U.S. declassification and Freedom of Information Act (FOIA) process. Storyflo narrates it directly from the public release.

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CIA Communists Prepare To Expand Korean Air War – An Intelligence Memorandum

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