The Office of Strategic Services (OSS) was a United States intelligence agency formed during World War II. It was the wartime intelligence agency, and it was a predecessor of the Central Intelligence Agency (CIA). The OSS was formed in order to coordinate espionage activities behind enemy lines for the branches of the United States Armed Forces.
The Basterds were commanded by the OSS. One such officer made a deal with Hans Landa, in which he will be exonerated by all the war crimes charges in exchange for allowing Operation Kino to be fulfilled.