So, the U.S. Navy—and basically every other navy worth mentioning—has this whole formal system for naming submarines. Civilians just say "submarine" and that's fine, but the navy? They've got official classifications, weird nicknames, and operational codes. The simplest answer is they just call it a "submarine" on paper. But ask anyone who actually serves on one, and they'll tell you something different. You'll hear hull classification symbols like SSN or SSBN thrown around, or class names like Virginia-class. And here's the thing—the most common nickname, the one you'll hear every sailor use, is "boat." Always has been, probably always will be. Officially? Yeah, it's "submarine," with the hull symbol "SS." But honestly, you almost never hear anyone actually say that in casual conversation. Instead, they use these alphabet soup designations that tell you exactly what the thing does. A nuclear-powered attack sub? That's an SSN. A ballistic missile sub carrying nukes? SSBN. These are the words you'll find in official documents, orders, and radio chatter—not "submarine" by itself. It's like a shorthand that says everything about the mission. This one's kinda cool, actually. Submarines are called "boats," never "ships." That tradition goes way back to when submarines were tiny, cramped little things that had to be carried on ships. The name just stuck. I mean, think about it—today's nuclear subs weigh like 7,000 tons, but everyone from the newest recruit to the commanding officer still calls 'em boats. It's a sign of respect, a nod to history. If you call a sub a "ship" in front of a submariner, they'll probably just look at you funny. The Navy breaks it down into three main buckets, each with its own name and job. These aren't just casual labels—they're used in planning and official stuff. Oh, and there's also research subs (AGSS) and training ones (T-SSN), but those three are the big players—the ones that actually go to war. So, the crew isn't really called a "crew" the way you'd think. They're the "ship's company" or just "the boat's crew." But the most specific term? The "submarine force." The guy in charge is the "Captain" or "CO," his second is the "XO." The whole group of sailors assigned to a sub is the "boat's complement." And there's this nickname for the whole community—the "Silent Service." It's all about stealth and secrecy, and it's kind of a badge of honor. Submariners have their own language, no joke. Here's a list of the usual ones: Technically, it's a vessel. But in naval tradition—and everyday talk—it's always a "boat." It's a custom that sets the submarine community apart from the surface fleet. Don't mess it up. SSBN stands for "Submersible Ship, Ballistic, Nuclear." The "SS" is submarine, "B" is ballistic missile, "N" is nuclear-powered. It's the official label for a boomer. A submarine is self-propelled, fully independent, and can stay underwater for weeks. A submersible is smaller, often tethered or battery-powered, and needs a support ship to launch and recover it. The Navy uses submarines for combat, not submersibles. That's a myth. Submariners aren't called "pigs." The term "pigboat" was for old diesel subs, not the crew. They're called "submariners" or "the Silent Service." Calling someone a pig isn't a compliment around here.What does the navy call submarines
What is the official Navy term for a submarine?
Why does the Navy call submarines "boats"?
What are the different types of submarines called in the Navy?
Hull Classification
Official Name
Primary Mission
Example Class
SSN
Nuclear-Powered Attack Submarine
Hunting ships and submarines, intelligence gathering, land attack
Virginia-class, Los Angeles-class
SSBN
Nuclear-Powered Ballistic Missile Submarine
Strategic nuclear deterrence (carries nuclear missiles)
Ohio-class, Columbia-class
SSGN
Nuclear-Powered Guided Missile Submarine
Land attack with conventional cruise missiles, special operations support
Ohio-class (converted)
What is a submarine crew called?
What are common slang terms for submarines?
Frequently Asked Questions
Is a submarine a ship or a boat?
What does SSBN stand for?
What is the difference between a submarine and a submersible?
Why are submariners called "pigs"?
Short Summary
