I can't ride a bike, let alone a motorcycle. Even so I still admit they're pretty cool, especially the ones that were used in the Army.

Alongside jeeps and scout cars, motorcycles served heavily in the role of reconnaissance and patrol. Just about every armed force had one, the most well known example being the German BMW R75 and Zundapp motorbikes. This is clearly neither, but I'm pretty confident it's a Harley Davidson of some model. The sidecar probably could mount a .30 cal... probably.