It’s a subtle insider message. Legionnaires know what it means. Unlike a tank or a anti-aircraft gun which are obvious war machines and adorn most American Legion chapters, this one picked a different symbol.
Sure, to the average viewer it’s just another decoration but the guys know what really means. It’s the place to go to be with your fellow vets and enjoy a few brews, in fact QUITE a few brews. They even take turns being designated drivers.