United States Type B53 Thermonuclear Training Device and Casing #photography #airplanes #avgeek #aviation #wingsovertherockies #highlight #wingsmuseum #nuclearbomb #b53 #casing #training #device #unitedstates #coldwar #airandspacemuseum #denver #colorado (Flickr 05.06.2017) https://www.flickr.com/photos/7489441@N06/34750820980