You're not screaming at me!

I can't hear you, [unintelligible].

Recruit: Aye, aye, sir!

Aye, aye, sir!

Aye, aye, sir!

Aye, aye, sir!

Narrator: This is Marine Corps boot camp

in Parris Island, South Carolina.

Before they become United States Marines,

all recruits have to graduate

from the Marine Corps' 13-week basic training program,

which tests them physically and psychologically.

Drill instructor: No one feels sorry for you!

Ty Kopke: It's a pressure cooker for 12 weeks

under the pressure of an intimidating drill instructor,

someone that's putting you under the scrutiny

of attention to detail every single day.

And, to a certain degree,

everything you do is never gonna be good enough.

Recruit: Everything at boot camp sucks.

It's gonna hurt.

It's gonna be painful,

but it's only gonna hurt more if you look at it that way.

Drill instructor: Around, around, around!

Kopke: It's boot camp, and it's supposed to prepare you

for the challenges that lie beyond.

[cadence]

Narrator: We spent five days at Parris Island,

where we saw different companies

at various stages of training.

Drill instructor: You will not run. You will walk.

Get on the yellow footprints right now.

Recruits: Aye, sir.

Drill instructor: You will do what you're told to do,

when you're told to do it, and without question.

Do you understand?

Recruits: Yes, sir.

Narrator: On day one of boot camp,

new recruits arrive at the receiving barracks,

where they take their first steps toward becoming Marines

by walking through these silver hatches,

symbolizing the threshold

between the outside world and Parris Island.

Drill instructor: You will walk through these silver hatches

once and never again.

Do you understand?

Recruits: Aye, sir!

Narrator: Once inside, recruits are processed

and assigned to their platoons.

Drill instructor: Put it up! Recruit: Yes, ma'am.

Drill instructor: I know you were told

not to come with your hair down.

Put it up in a bun.

In a bun, bun, bun,

bun, move faster. Recruit: Aye, ma'am.

Aye, ma'am.

Narrator: After graduation, Marines commit to a minimum

of four years of service.

Upon entering the Corps, an entry-level private

will earn around $20,000 a year.

Drill instructor: Sit down. Recruit: Yes, sir.

Narrator: Recruits are required to make a phone call

to a family member or their recruiter

to let them know they've arrived.

Recruit: This is recruit Hatcher.

I have arrived safely at Parris Island.

Please do not send any food

or bulky items to me in the mail.

Narrator: They're only allowed to read

the script printed for them inside the phone bank.

Recruit: I will contact you in seven to nine days

by letter with my new address.

Thank you for your support.

Goodbye for now.

Drill instructor: Get in the classroom.

Recruits: Aye, sir.

Narrator: Recruits are given three chances

to get someone on the line.

Recruit: Sir, my recruiter's not answering, sir.

Drill instructor: Call him again.

Narrator: Not every recruit is able to make a connection.

Drill instructor: If there is no answer,

hang it up and close it.

Recruit: Aye, sir.

Narrator: But they won't have long to dwell on it.

The Marine Corps Recruit Depot in Parris Island

sits on 8,000 acres of the South Carolina Lowcountry.

It's one of two enlisted recruit depots

in the United States.

The other is in San Diego,

where only male recruits are trained.

Around 20,000 recruits

graduate from Parris Island every year

before joining the more than 180,000

Marines actively serving today.

Kopke: We take young men and women from all walks of life,

all cultures, maybe they were rich, maybe they were poor,

they've got different religious backgrounds,

they are the melting pot of America.

And they come here with one common goal,

and that's to be a United States Marine.

Clip: Parris Island, South Carolina.

Here, everyday Americans become Marines,

the toughest fighting men in the world.

Narrator: Male recruits have been trained

at Parris Island since 1915.

Female recruits began to train there in 1949.

[whistling]

Recruits: [yelling]

Narrator: Today, females comprise under 25%

of recruits at Parris Island

and approximately 8% of the United States Marine Corps,

the lowest percentage of any United States military branch.

[cadence]

A recruit's day begins before the sun comes up.

Their typical wake-up call is 0400, or 4 a.m.

[yelling]

Recruits endure an intense series of physical challenges.

Drill instructor: Four, three, am I hearing that right?

Four, three?

Recruit: Yes, sir.

Drill instructor: Fail!

Narrator: Some recruits arrive

in better shape than others.

Kopke: Some never did anything more than sit on a couch,

you know, as a couch potato.

And some may have been collegiate athletes.

So there's a vast spread

of what their athletic fitness and ability is.

Recruit: Aye, sir.

Narrator: Much of their training happens here,

in Leatherneck Square, where a series of

intimidating obstacles comprise the confidence course.

Drill instructor: No, I'm tired of watching you

freaking fail. You failed this event.

Nope, just grab your canteens and go, you failed this event.

Recruit: May this recruit have one more try, sir?

Drill instructor: What did I just say?

Recruit: Aye, sir.

Drill instructor: What'd I just say?

Recruit: Aye, sir! Drill instructor: Go!

Recruit: Aye, sir.

Kopke: The training program is progressive in nature.

It starts out in a crawl, walk, run approach,

throughout training.

99.9% of those that get here

can complete all those requirements at the end of training,

regardless of how they started.

Recruit: I'm slipping, please, please help.

I don't want to do this.

Drill instructor: You're fine.

Recruit: No, I'm not, please.

Drill instructor: Good lord, son.

Narrator: Any recruit with a fear of heights

gets the chance to conquer that fear,

courtesy of this 47-foot-tall tower.

Recruits must rappel down using two different methods.

Recruit: For me, the rappel tower was hard

'cause I sort of had a fear of heights.

Drill instructor: Grab hold of my right hand

with your right hand.

Recruit: You have to trust a rope,

so there's nothing to be worried about.

You'll be safe all the time.

Recruit: Can you please help me?

Drill instructor: I'm trying to help you, son.

Recruit: I don't wanna go down.

Narrator: Recruits with a phobia of heights

have little choice but to face their fear.

One of the most dreaded parts of training

is the gas chamber.

Drill instructor: Crush, crush, crush, crush.

Narrator: Where recruits are exposed to CS gas,

more commonly known as tear gas.

Once the recruits enter the chamber,

they break the seals of their gas masks.

Recruit: You go in. You feel it instantly hit your skin.

You just feel burning.

Drill instructor: Say something to me, now.

Recruit: Feels like those few minutes felt like an hour.

Narrator: After around five minutes,

the recruits are free.

But the pain endures.

Recruit: Definitely, you thank God for fresh air.

It's really nice to be able to breathe in

and not feel an instant burning sensation.

[coughing]

Antonio Garay: Gas chamber's important because it

builds confidence.

Confidence in the gear, confidence in the drill instructors,

and then confidence in themselves.

Narrator: Recruits are trained

in different styles of hand-to-hand combat.

Drill instructor: First thing we wanna see is that straight

thrust, you understand? Recruits: Yes, sir.

Drill instructor: Or that butt stroke. Scream aye, sir.

Recruits: Aye, sir.

Narrator: A key aspect of their martial arts training

is fighting with pugil sticks.

Drill instructor: You kill that opponent, you understand?

Recruits: Aye, aye, sir!

Narrator: The pugil stick techniques are intended

to mirror those used in combat while using a bayonet.

Darrin Hill: Here in the Marine Corps we have

kind of a little ditty that means red is dead.

[whistling]

[cheering]

So, that red side, it's supposed to emulate

the actual knife portion of the actual bayonet

mounted on the weapon.

So anything that you strike with that red tip,

nine times out of 10, are either gonna be

incapacitated or laid to rest.

[whistling]

Honestly, it gives them an opportunity

to blow off a little steam.

They have a lot of pent-up aggression,

especially towards, maybe, their drill instructors.

They're out there, they're actually doing what they feel

like they signed up to do,

which is learn how to combat the enemy.

Narrator: Recruits also practice with actual bayonets.

Recruit: Marine Corps, Marine Corps,

Marine Corps, Marine Corps.

Drill instructor: Fight back, you!

Narrator: And engage in other types

of hand-to-hand combat.

Drill instructor: Grab the muzzle.

Recruits: Freeze, get back, get back.

Narrator: Although male and female recruits

do intersect during training,

platoons are separated by gender.

And although the Recruit Depot has experimented

with integration before,

the Marine Corps is the only military branch

that separates male and female recruits

during basic training.

According to the Corps, every Marine

is first and foremost a rifleman.

Recruits spend the bulk of two weeks

devoted to marksmanship...

the first of which sees few shots actually fired.

Jonathan Gilbert: First off is the fundamentals.

They have to understand how to aim.

They have to understand exactly how to breathe

when they're taking that shot.

They have to understand exactly how to squeeze the trigger

and how to have follow-through and recovery with the rifle.

Kopke: Combat operations is the foundation for

every single Marine, regardless of what your occupation is.

What it is to sit behind a rifle,

look down that barrel, and be able to put lead on target.

[gunshots]

Recruits: Aye, sir.

Drill instructor: You are going to swim

until you pass that ladder.

Recruits: Aye, sir.

Narrator: The Marine Corps is defined

as an amphibious warfare force.

Therefore, swimming plays a key role in training.

Narrator: During swim week,

recruits go through numerous exercises in the pool

while wearing their camouflage uniforms.

But training at Parris Island isn't all physical.