U.S. Army To Junk Dirigible Rs - 1 -- The Army dirigible R.S.1. once the pride of the Army and the largest semi rigid dirigible in the world, is to be junked. The craft was built at a cost of $600,000 - an experiment in aeronautics for which a St. Louis Junk dealer is to pay $900. August 3, 1931. (Photo by International Newreel Photo). ;U.S. Army To Junk Dirigible Rs - 1 -- The Army dirigible R.S.1. once the pride of the Army and the largest semi rigid dirigible in the world, is to be junked. Th