Film opens showing logo of "mosquito boat." A flotilla of the boats is seen tied up at docks. They include PT boats (patrol torpedo boats) numbers PT 10, 11, 12, and 13. View from Florida shore as some ot these PT boats speed through the water. Aerial view of several of them racing over the surface of the water, leaving huge wakes behind them.Closeups of some approaching the aerial camera. View from another PT boat, of PT-17 riding close behind in the camera boat's wake. Extreme closeup of PT 17 bow. Other views of the PT boats generating large wakes as they pass the camera. Another aerial view of the boats running in parallel formation.
Tests of GB-4 bombs (precision guided munition) in the United States during World War II. Three technicians operate a GB-4 television receiver and test equipment at Eglin Air Force Base in Florida.