another son of david colbert mccanles, julius mccandless, was the father of commodore byron mccandless, usn, recipient of the navy cross in world war i. david's great-grandson was rear admiral bruce mccandless, usn, recipient of the congressional medal of honor in world war ii, and his great-great-grandson was captain bruce mccandless ii, usn, the nasa astronaut who made the first untethered spacewalk.