Periscopic Sextant This item was designed to be used by navigators on C-123 aircraft. Click here to return to the Featured Accessions index. Find Out More Related Fact Sheets Fairchild C-123K Provider Note: The appearance of hyperlinks does not constitute endorsement by the National Museum of the USAF, the U.S. Air Force, or the Department of Defense, of the external website, or the information, products or services contained therein.