Thousands have watched the video and most have been asking the same question. Who is the officer who jumped into the water in fully uniform to rescue Jeff McCann, the racer who wrecked while approaching the finish line at the Shootout? That officer’s name is Corporal David Echternacht. Captain Matt Walz tells us that Echtneracht is a marine instructor at the academy. When McCann wrecked, he laid face down in the water unconscious before Corporal Echternacht arrived on scene and leaped into the water, immediately flipping him over.