Sergeant Peter J. Chartier
Professionals
The United States Marine Corps (USMC) is a branch of the United States military responsible for providing power projection from the sea, utilizing the mobility of the U.S. Navy to rapidly deliver combined-arms task forces.
Originally organized as the Continental Marines on 10 November 1775 as
naval infantry, the Marine Corps has evolved in its mission with
changing military doctrine and American foreign policy. The Marine Corps
has served in every American armed conflict including the Revolutionary
War. It attained prominence in the 20th century when its theories and
practice of amphibious warfare proved prescient and ultimately formed
the cornerstone of the Pacific campaign of World War II.

The United States Marine Corps serves as an amphibious
force-in-readiness. Today, it has three primary areas of responsibility
as outlined in 10 U.S.C. § 5063, originally introduced under the
National Security Act of 1947:

A lot of class... All First!!!
The quoted clause, while seemingly a consequence of the President's position as Commander-in-Chief, is a codification of the expeditionary duties of the Marine Corps.
It derives from similar language in the Congressional Acts "For the Better Organization of the Marine Corps" of 1834, and "Establishing and Organizing a Marine Corps" of 1798.
In 1951, the House of Representatives' Armed Services Committee called the clause "one of the most important statutory—and traditional—functions of the Marine Corps."

We all came together,
Both young and old
To fight for our freedom,
To stand and be bold.
In the midst of all evil,
We stand our ground,
And we protect our country
From all terror around.

Peace and not war,
Is what some people say.
But I'll give my life,
So you can live the American way.
I give you the right
To talk of your peace.
To stand in your groups,
and protest in our streets.

But still I fight on,
I don't bitch, I don't whine.
I'm just one of the people
Who is doing your time.
I'm harder than nails,
Stronger than any machine.
I'm the immortal soldier,
I'm a U.S. MARINE!

So stand in my shoes,
And leave from your home.
Fight for the people who hate you,
With the protests they've shown.
Fight for the stranger,
Fight for the young.
So they all may have,
The greatest freedom you've won.

Fight for the sick,
Fight for the poor.
Fight for the cripple,
Who lives next door.
But when your time comes,
Do what I've done.
For if you stand up for freedom,
You'll stand when the fight's done.

By: Corporal Aaron M. Gilbert, US Marine Corps
USS SAIPAN, PERSIAN GULF