Also, 50% of the time, the comm isn't listened to on that server. Especially if you arent' known. I have trouble getting them to, at least. However, they do know the game, so just follow them and give meds ammo when needed, and keep teching. Then you can use some things you learn in other pubs...
However, if you think playing marines on the Vet server is a nightmare, go aliens :/