On July 25, 1962, NASA invited 11 firms to submit proposals for the LEM. Of the 11 invited, 9 submitted proposals. The firms that submitted proposals were Lockheed, Boeing, Northrop, Ling-Temco-Vought, Grumman, Douglas, General Dynamics, Republic, and Martin Marietta. Grumman was the winner. This model is owned by the Cradle of Aviation Museum in Long Island NY.