The Navy League's Sea-Air-Space Exposition is the largest maritime expo in the U.S., and brings together dozens of defense contractors and military decision-makers. The Motley Fool's Rex Moore was at the event in National Harbor, Maryland, and saw demonstrations of several technologies. In the video below he shows us how General Dynamics (NYSE:GD) is increasing the capability of U.S. submarines, including new ways to launch and recover the Lockheed Martin (NYSE:LMT) autonomous underwater vehicle.

Rex Moore has no position in any stocks mentioned. The Motley Fool owns shares of General Dynamics and Lockheed Martin. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.