I haven't fought on the ground, but I have in the air. Remember those scenes where the guys in the helicopter were relaying to the vehicles when to turn? If you read the book, it goes into much greater detail what happened there. The point being, communication is always an issue, either intra-unit or inter-unit. Air Force, Army, Navy, etc. Comms stability/channel overload is a huge pain in the ass. I've used the most high tech stuff there is and sometimes just plain line of site radio works better. The AF lives over the radio. On a busy strike freq. it's absolutely amazing that you can get a word in edgwise when the the push is on and everybody is pressing towards the targets. When an aircraft starts talking to a guy on the ground, with the intention of delivering ordinance, you not only WANT good comms, you NEED them or you might just royally fuck yourself for the last time.
my 2 cents for now...
-nuts