The Boeing B-52 Stratofortress is a long range jet bomber which has been continually operated by the United States Air Force since the 1950s.  Designed as a high altitude strategic bomber it is manned by a crew of 5, including a pilot, copilot, weapons system officer, navigator, and electronic warfare officer (a tail gunner was also part of the crew up until 1991).  Still in use today, it is expected to continue active service well into the 2040's