All the good teams do it!!!

Think of CTF like it is football, and the flag is the football. Play guard and if you get into clash with the other team stay right on the flag carrier so if he dies you can recover the flag.

Also, for the flag carrier...let your team block for you. Don't blaze ahead by yourself. Slow down if you start getting ahead...let your team soften the up the other team's defense. If you are about to die float on a team mate that's has the most life and is good, so when you die he takes the flag.