No wonder they smoked the Skins.

SI’s Peter King: Factoid of the Week That May Interest Only Me

Prior to Sunday’s road game against Washington, the 49ers had their Saturday morning walk-through practice at a field at the Marine Barracks in southeast Washington. After practice, coach Jim Harbaugh told the players to break the huddle down by saying “Semper Fi.” A few players wondered, “What’s that?” They were told it was the Marine motto and means “Always Faithful.”

And so, with Marines lining the field and watching, the players yelled, “One, two, three, Semper Fi!”

Then Harbaugh had the team buses take a detour on the way back to its Pentagon City hotel — to the Tomb of the Unknowns. Most of the players and staff had never been there. They spent about a half-hour getting a history lesson and then, silently, watching the solitary guard pace slowly in front of the tomb.

Now that’s the way to spend your Saturday morning on the road in the nation’s capital. In the words of Mad Dog Russo, “That’s a good job by Harbaugh!”