Of course they should. Because oftentimes, they are the same people. My civilian brother, Max Lindenman, elaborates.
Here’s my brief take on the subject. Many Marines I have known over the years have been great artists, and I mean across the entire spectrum too. This idea that you are only “one thing,” and that thing being a stereotype of what you happen to be doing for a living, is a fallacy. In fact, since it stems from some version of the truth, it is a heresy. A heresy that doesn’t factor in the full spectrum of the human being’s experience, but instead attempts to pigeon hole folks as mere widgets.
Here’s a museum specializing in just this type of art and artist. Which is where Maurice Costello’s art (showcased above) can be found.