What did the declassified documents reveal?

This is a declassified United States Air Force intelligence memorandum concerning Chinese and Soviet air activity from twenty‑fifth October to first November nineteen‑fifty. The document is notable because it provides a contemporaneous assessment of underground airfields, Soviet‑directed construction, and the influx of Soviet aircraft into the Chinese theater during the early months of the Korean conflict. The memorandum was made publicly available through The Black Vault archive. The release appears in the online collection under the title “US Intelligence on China CI00551 – Soviet AOB and Significant Air Developments, 25 October‑1 November 1950 Inclusive Includes Attachment; Best Available Copy, Top Secret, Memorandum, November 02, 1950.” The file was posted to the archive on the date the collection was digitized, and the declassification authority is indicated as the United States Air Force historical office. The document reads as follows: Colonel Le. ace pie degrees, | arte “aS ‘gt! Exe ere pe . “AS St. for Production eliigenco = a a ee enn . gue rs pee a 3 SECRET “Huth eS, USAF meuniere of Toul eccmmenin thet detedied oniny ataites bs mde of the underground hangers aaa Wonsen and Ong, The hangers were bullt by the North Soyoan ona, youelbhy under Soviat direction. Such studies, it/is a, bag Ssindude this vémiits of the United Netdona ; dibig of ‘these dustalbatiods | | the Desk Povew Cominsider adiied that ndergewund hengeie aay tony an the future, what sied bere proven to be Sanne dn Yoneen Hexber, and thes ‘te developed whieh WiT2 permit the destruction of similar types of Sneteliwblons SHORED | orinanes mat CORT Zandt, small goes sac i stetnan whe B26 sho down one of the . ¢ ere SP eT cae Pa od ARE Sek ys, kee! Cake, EOE gies dehaes ee Senet es dae eS ae at satu the Soviets hove nov for tee ° Sixet AG. wD met sl yeaa = were reported ta tho tate at sesacibie acuta Serer apes a tide ary Ader Porte, 4 mat aye. tena tet divisors tn Uxium > may have: meunged. Zor advan s fad a ay eee the foes 5 Gioned. cud. Jot) in Herth Loves wh thie sine gouald ‘be x fe ¢ oo pieiinegei a wth — om the eutey of Chlnage ante Race “thmerbiis ‘reposts have bee received thet members of the: | Boar Gorin porandistery police (Wolkapolized Berwitschatten), 1 those whe eve also mentors of the Free Game Youth CDs are boing given glider tenining ag & possible prelude “bo diving. Beouuse af the nunber ett variety sores ox éhsee coportin,, the situation de be: ene . watched. Politica. abi ty As dala to be 4 prine requisite in the selection of routers i dy beldeved that guoh pilots might nevleus aon visioh, nn Rast Geman (pon) 4 hat Fores con to . a was enor | | Hommsiibe,y the jet ‘eoetets dn the Soviet Zone baa dnereased (during Septenber) tyon, S72 WiGIS's to 423 ond ‘trom 17 “olostr'e to 18, During this amme period, 268 ooriventional, fighters hove | been dropped from active aixfields, TOP suse become ‘

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.

Case File · ARCHIVE-005Declassified

Filed OCT 30 · 2026Runtime 1 min

United States Air Force Intelligence Memorandum Concerning Chinese And Soviet

U.S. public record · FOIAUpdated October 30, 2026

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◆ BLUF — The short version

This is a declassified United States Air Force intelligence memorandum concerning Chinese and Soviet air activity from twenty‑fifth October to first November nineteen‑fifty. The document is notable because it provides a contemporaneous assessment of underground airfields, Soviet‑directed construction, and the influx of Soviet aircraft into the Chinese theater during the early months of the Korean conflict.

Date: OCT 30 · 2026
Release: Declassified · U.S. public record (FOIA)
Source document: View the primary source document

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What was United States Air Force Intelligence Memorandum Concerning Chinese And Soviet about?: This is a declassified United States Air Force intelligence memorandum concerning Chinese and Soviet air activity from twenty‑fifth October to first November nineteen‑fifty. The document is notable because it provides a contemporaneous assessment of underground airfields, Soviet‑directed construction, and the influx of Soviet aircraft into the Chinese theater during the early months of 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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