Out of the entire Marine Corps, only four men can call themselves West Wing Sentries.
The official name for West Wing Sentries is the White House Non-Commissioned Officers, and the United States Marine Corps have that exclusive responsibility.
From the time the President arrives at his office, to the time he leaves, these elite Marines stand guard outside the West Wing.
https://americanmilitarynews.com/2016/03/a-look-at-the-elite-marines-that-stand-sentry-outside-the-west-wing/