Sickles was a very good illustrator. He could depict people, something competent illustrators of his day could be expected to do. But he also was excellent depicting vehicles of various kinds -- ships, cars, aircraft and military equipment. I discussed his versatility here
The present post features some of his illustrations from the early days of World War 2 that appeared in Life, America's number one image-based magazine at the time. As best I can tell, all the scenes below are the fruits of Sickles' imagination, but the details are realistic, showing uniforms, equipment and such. Click on images to enlarge.
here. Sickles made numerous illustrations for Life during World War 2, many with the subject of tanks and dealing with them. For what it's worth, I would not want to attack a PzKpfw IV armed with the tommy gun and other light weaponry shown in the drawing.