You can also click the Add layer mask icon at the bottom of the Layers panel (which, by default, selects Reveal All). Note that if you already have a layer mask on the layer, this icon will change to Add vector mask. Or you can click the Add a Layer Mask icon in the Properties panel.
The top American ace of all time, the U.S. Ace of Aces was Richard Ira Bong. He shot down 40 Japanese planes in the Pacific. Over the years, there's been a lot of ink spilled about the relative scores of German and American aces. 27 Americans shot down over 20 enemy planes.
America paid a terrible price for its involvement in the Vietnam War - nearly 60,000 killed-in-action, over 150,000 wounded, and some 1,600 missing. 100 Years of World War 1. World War 1 Aircraft. Over 150 entries and counting. Aircraft Ranked-by-Speed. From fastest to forgettable.