Question: ACES II is an ejection seat system manufactured by the United Technologies Aerospace Systems (UTAS) division of the United Technologies Corporation (UTC), it is used in which supersonic variable-sweep wing, heavy bomber used by the United States Air Force (USAF)?
Sentence (from "1968 Thule Air Base B-52 crash"): On 21 January 1968, an aircraft accident (sometimes known as the Thule affair or Thule accident ( ); Danish: "Thuleulykken" ) involving a United States Air Force (USAF) B-52 bomber occurred near Thule Air Base in the Danish territory of Greenland.
Relevant evidence: No