for teamplay:
use the radiocommands one time, don't re-enter it when you don't hear anything, I often hear 5 times the same person saying the same thing
Use the radiocommands wise: do not say in canyon: 'attack the power plant', or say al the radiocommands in less then a minute to see if it works, a lot of ppl want to say something usefull but nobody listends
In rushes, don't start it at the base: wait at there base until everyone is there, then attack