In The US Tank school, the following are definitions, as appropriate, by the different organizations that support the tank:

In the tank gunnery school, you are taught that if your tank could move, and communicate but could not shoot, what you had was a worthless tank.

In the tank propulsion school, you are taught if your tank could shoot, and communicate, but could not move, what you had was a worthless tank.

in the tank communication school, you are taught that if your tank can move, and communicate, but can not shoot, what you have essentially is a 52 ton portable radio.

hmmmmmmm