The school opens its doors for a player to enter the system, closes them so they can move up and improve, and then lets them off once they've reached the top of their game, where the NFL can be found waiting.
It's no coincidence that USC currently has more defensive linemen in the NFL than any other position.
Forget Linebacker or Tailback U.
And young players have taken note.
Defensive end Greg Townsend Jr., the son of All-Pro linemen Greg Townsend Sr., redshirted in 2011. But he said the year was a great experience for him, because he got to study expected NFL first-rounder Nick Perry.
"I talk to him a lot, just about things off the field, things on the field. Like how he got better his redshirt freshman year to his freshman year," Townsend said. "I want to have somewhat of a similar career path as he had, so I get a lot of pointers from him."
"Just watching him play in practice it motivates me to have that kind of career. He just told me 'don't worry about the next man. Worry about yourself,'" Woods recalled.
DeVante Wilson, who greyshirted in 2011 but still spent time on campus rehabbing from knee surgery, picked the brain of another Trojan. Chris Claiborne, the linebacker and one-time bearer of USC's acclaimed No. 55 jersey, was Wilson's high school coach at Corona.
"He had the same injury [as I did]. He tells me to keep my head up, gives me advice," Wilson said. "He helps me stay motivated."
As these redshirters see the success others before them had, it only helps the linemen cycle continue.
Even as the competition gets steeper. With new players like Florida native Leonard Williams or early enrollee Morgan Breslin challenging these freshmen for spots, they are forced to continue a work ethic like their mentors once preached.
"Being able to see my other teammates work hard pushes me to work even when I don't feel like working hard," Woods said. "Seeing my other teammates work every day motivates me and I don't want to let them down."
The pressure is obvious. Whether its from one's NFL bloodlines, coaches, or fan expectations, these freshmen feel it. And the preseason No. 1 ranking only makes them more aware.
"I'm excited about this year. I know we lost some guys but we still feel like we got it. We're all working hard together to just be at the same level last year," Townsend said. "Because last year the d-line they just did some great things so we just want to keep moving in that direction."
"I'm excited too. I think we're strong as a core. We lost some guys but we'll be able to replace them."
It's customary: new replacements for a new year.
In. Improve. Out.
Talented Trojans are welcomed as the polished ones bid adieu.
"We get to rotate more, we'll have more weapons," Townsend said.
It seems as though they always have weapons; that linemen elevator rarely needing repair.
Even as the individuals change and teams evolve, those doors still open, produce and close.
And that pattern isn't lost on USC's youth.