6 surprising things about US military boot camps

• New recruits aspiring to join the military all have to go through boot camps.
• This rigorous training prepares soldiers, sailors, airmen, and Marines for their time in the service.

Across the many branches of the US military, there is one constant for new recruits: a weeks-long period of basic training — "boot camp" — to prepare for the job.

At each boot camp, recruits have to learn different skills like swimming or climbing and practice the tasks they'll need during their service, from assembling a pistol to driving a tank.

But that period of time varies with each branch of service. Navy recruits, for example, endure a 10-week-long program, while Marine Corps recruits face 13 weeks of grueling basic training.

Insider has gone inside basic training at different boot camps as part of its "Boot Camp" video series exploring what life is like for recruits.

Insider Correspondant Graham Flanagan shared the most surprising things we didn't expect to find at boot camp:

Army: Not everyone who joins the Army and works with heavy guns and weaponry has previously fired a weapon.

US Army Tankers training in Fort Benning, Georgia.      Screengrab/Insider

Source: Insider/What Army Tankers Go Through In Boot Camp

Navy: Not every recruit knows how to swim or is even comfortable with being in the water. You don't need to know how to swim before joining the Navy.

Navy recruits swim inside a pool during basic training.      Screengrab/Insider

Source: Insider/What Navy Recruits Go Through In Boot Camp

Navy: Recruits work on their marksmanship during basic training, learning how to safely fire a pistol — as well as assemble and disassemble the weapon.

Navy recruits fire pistols during basic training.      Screengrab/Insider

Source: Insider/What It Takes To Survive Coast Guard Boot Camp

Coast Guard: New recruits endure lots of yelling and intensity, including when they sit down for lunch. Before they can eat, recruits are stopped by company commanders and must answer questions about the Coast Guard.

A Coast Guard recruit is yelled at during lunch.      Screengrab/Insider

Marine Corps: Not everyone who shows up for training is built like a superhuman, or is in top athletic shape.

Recruits at Marine Corps basic training.      Screengrab/Insider

Source: Insider/What New Marine Corps Recruits Go Through In Boot Camp