Communication has always been one of the most important elements of warfare. During the Second World War and the decades that followed, armies, navies, and air forces relied on rugged mechanical communication systems to coordinate operations across land, sea, and air.

Long before the digital age, soldiers depended on wired field telephones, headsets, microphones, and s...

You can see all three of the historic sub-machine guns discussed below in our latest video, where Raz examines each example in detail and places them in their historical context. Watch the full feature on Facebook,