A lone piston-engined warbird holds on the runway at the Tennessee Museum of Aviation in Sevierville, Tennessee, during the air show of 7 June 2014, framed against a red-roofed barn, summer woodland and the receding blue ridges of the Great Smoky Mountains. Photographs like this one document the modern commemorative side of the Donald L. Engebretsen collection: reunions, museum events and flying displays at which Vietnam-era aircraft and the men who flew them are brought together for new audiences. Project: 219310