The first time your sailor calls home and says something like, "My RDC put the whole compartment on watch because someone's rack wasn't squared away," you might just stare at the phone. Every branch has its own language, and the Navy has one of the thickest. You don't need to memorize all of it—you just need enough to follow along, ask the right questions, and feel a little less lost. That's what this glossary is for.
Quick answer: Navy boot camp comes with its own vocabulary built around RTC Great Lakes—terms like RDC (the instructor in charge), Division (your sailor's group), Battle Stations 21 (the final test), and Pass-in-Review (graduation). Below, every term is explained the way a mom actually needs it, not the way a manual would.
People and Places You'll Hear About
These are the terms that show up most in letters and phone calls during the early weeks, when your sailor is still finding their footing.
- RTC Great Lakes—Recruit Training Command in Great Lakes, Illinois, is the Navy's only boot camp. Every enlisted sailor, regardless of what they'll do afterward, trains here first.
- RDC (Recruit Division Commander)—the Navy's version of a drill instructor. An RDC is responsible for training, discipline, and welfare for one division from day one through graduation. If your sailor mentions "my RDC," this is who they mean.
- Division—the group of recruits your sailor trains with, roughly equivalent to a class or company in other branches. Divisions stay together for the entire training cycle, right through pass-in-review.
- Compartment—the large shared space where a division lives, sleeps, and stores everything they own. It's also where mail calls happen, which is why letters matter so much—see our full guide to what you can and can't send during Navy boot camp if you're wondering what will actually reach your recruit.
- RPOC (Recruit Chief Petty Officer)—the top leadership position among the recruits themselves, appointed by the RDC. The RPOC relays orders, keeps the division organized, and answers directly to the RDC. If your sailor gets this role, it's a real vote of confidence from their instructors.
- A-School—the technical training a sailor attends right after boot camp graduation to learn their specific job. Most sailors move here within days of pass-in-review.
The Final Test and Graduation
This is the part of the journey most moms end up researching hardest, because it's the last hurdle before you see your sailor again.
- Battle Stations 21 (BST-21)—the 12-hour, overnight final test every recruit must pass to graduate. It takes place aboard the USS Trayer, a full-scale mock destroyer built inside a training facility at Great Lakes, and simulates real shipboard emergencies like fires and flooding.
- Capping ceremony—held right after Battle Stations 21 is complete. Recruits trade their "RECRUIT" ball cap for a "NAVY" one—the moment they officially become sailors instead of recruits.
- Pass-in-Review (PIR)—the official name for Navy boot camp graduation. It's the ceremony families attend, usually preceded by a Family Day the day before. If you're already thinking about what to bring, we've put together a full pass-in-review gift guide for exactly this.
Everyday Navy Slang You'll Pick Up
You don't need these to survive boot camp season, but you'll hear them constantly once your sailor is out in the fleet—and they're part of what makes Navy identity so distinct.
- Salty—used to describe someone who's experienced, weathered, or a little rough around the edges from time in the fleet. Sailors sometimes use it about themselves half-jokingly ("feeling salty today"), and it's become a popular way for Navy moms to describe their own pride, too—a little worn in, a lot proud.
- Shipmate—the Navy's word for a fellow sailor, used constantly from boot camp onward. It's less about rank and more about the built-in loyalty of serving together.
FAQ
What does RDC stand for in the Navy? RDC stands for Recruit Division Commander—the instructor responsible for training and overseeing a division of recruits throughout boot camp at RTC Great Lakes.
What is Battle Station 21? Battle Stations 21 is the 12-hour final test recruits complete aboard the USS Trayer, a shipboard simulator, before they're allowed to graduate and officially become sailors.
What does "pass-in-review" mean? Pass-in-Review, or PIR, is the official name for the Navy boot camp graduation ceremony that families attend at RTC Great Lakes.
What does "salty" mean in the Navy? "Salty" describes someone experienced and weathered by time in the fleet. It's used both seriously and affectionately, including by Navy moms describing their own pride in the journey.
Final Thoughts
You don't need to speak fluent Navy to support your sailor—you just need enough to keep up with the stories and understand what they've actually been through. Every term on this list is one less thing standing between you and really knowing what your sailor's days look like.
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