Lt. Brad Snyder’s presentation at the Navy League’s annual Sea-Air-Space symposium outside Washington, D.C., didn’t have any PowerPoint slides. “I can’t see it, so you can’t either,” he said during the Monday afternoon speaker floor session at the Navy League booth. Snyder was blinded by an improvised explosive device blast during a deployment to Afghanistan in September 2011. During his recovery, the Naval Academy grad and former swimmer got back into the pool to regain his confidence. He never imagined it would lead him to the London Paralympics last summer, where he won two gold medals and one silver. The…