We did. See the Navy's A-12 stealth bomber, a design that never flew [1]. [1] Stevenson, James P. The $5 Billion Misunderstanding. Annapolis, Maryland: Naval I

We did. See the Navy's A-12 stealth bomber, a design that never flew [1]. [1] Stevenson, James P. The $5 Billion Misunderstanding. Annapolis, Maryland: Naval Institute Press, 2001. ISBN 1-55750-777-5.