oooooOOOOO a ZIPPO Track!!!!
Most of the field telephones for the infantry went out when the Abrams was first introduced as it was supposed to SPEED across the battlefield and infantry walking just wasn't in the picture (bean counters at work again).
Some genius actually figured out that some guys with mud on their boots might like to talk to the guy in the big armored thingy over there, and that the aforemention guy with mud on his boots might not have a radio.
Whodathunkit.....
L