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.
The best propellor fighter was possibly the P-51 but it was close to the Focke-Wolfe 190 and Spitfire. The fastest propellor plane was the Dornier Do-335 Pfeil. Probably the most advanced plane of the war was the Horten Ho-229. The most advanced transport of the war was the Arado 232. The most versatile plane of the war was possibly the DC-3 or the Junkers JU52. The ME-262 was a great fighter and jet powered, but it had many shortcomings, not to mention short life of the engine and vulnerability at take off and landings.