Exactly what I would have said friend. Glad to see you here CUDA.
Steffpeck and newestchick,
Cuda is right about those boys looking after their ladies! Even the most gentle of roosters will "defend" their flock. Even in the off season, if a threat is perceived, eg. sudden movements, strangers, loud noises and "small people" can set a rooster off. If new people are to be around your flock in the near future I would suggest "introducing" them to the fowl. You could have new people come along for several feedings and handling sessions. Have the newcomers talk to the birds, or maybe even whistle during their approach, just to be certain that the birds know who is coming around so that they aren't startled and don't perceive them as a threat.
It may be a bit unorthodox but I have stumbled upon a technique that really seems to help with aggressive behavior.
We have all seen a rooster top a hen right. And we have all seen how a hen acts around a dominate rooster, crouching down to allow him to top her. If you have a rooster that has recently begun biting or trying to spur you, you can carefully, slowly, and deliberately pick up the aggressive bird and carefully force him into a squatting position. keep your hand on his back and apply only enough pressure to keep him down. You then lightly pinch the skin near the back of his neck and pull it back, mimicking how a rooster pulls on a hens head when he mounts her. While you have him like this you slowly move the hand that holds him down back and forth, again mimicking the movement of a rooster mounting a hen.
This seems to "trick" the rooster into thinking that he has been dominated and he will usually submit. It may take several times for him to fully relent. I have found that this works better with the younger roosters and was, by no means, done in a scientific setting.
I hope this helps some.