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.
German fighter aces Max Immelman and Oswald Boelcke become the first two pilots to receive Germany's highest award for bravery, the Pour le MÃ©rite. By the summer of the same year, Immelmann had been killed and Boelcke is Germany's leading ace. 2 February Zeppelin LZ54 (L19) is shot down by British aircraft over the North Sea. 6 February