[Anaraxes]

Many US armored units would acquire (or "acquire") standard infantry field telephones and mount them to the backs of their tanks, often in an ammo container, then wire the phone to the crew intercom inside the tank. Friendly infantry could then just pick up the phone and talk to the tankers to coordinate or point out targets. Some units just trailed a wire behind their tank so that the infantrymen could just grab the wire from cover and plug in the phone they already had.

Many US infantry would improvise a crystal radio out of whatever they could make work (pencil lead, razor blades, etc). Crystal sets were useful because they need no additional power to operate. Troops could then listen to their "foxhole radios" for whatever morale value that would have.