Whenever I played Rainbow Six 3 as a kid, I always organized a full team of Rainbows, only to kill them all with one specific soldier, then completing the mission solo with said soldier. I could never figure out why I used to this.
While I guess it's a legitimate strategy, I never beat The End in MGS3 without the day-skipping trick when I was a younglin. It was not until MGS3 HD that I could redeem myself.