Defining “Army” in the 21st Century: What Counts and What Doesn’t
Let’s be clear about this: not all “armies” are built the same. Some nations have tanks, fighter jets, and conscription. Others rely on foreign defense agreements or keep only a handful of armed personnel for ceremonial duties. The CIA World Factbook, widely used for comparative stats, includes paramilitary units—like coast guards or gendarmeries—when listing military personnel. That changes everything. Take Iceland. No standing army. Zero. But it has a 100-person armed unit under the police, trained for crisis response. Is that an army? Not really. But technically, in some databases, it counts.
Then you’ve got city-states like Monaco, with 285 active military personnel (the Compagnie des Carabiniers du Prince), primarily tasked with protecting the royal family. They wear uniforms, carry guns, drill weekly. But they’d be overrun in hours if a real conflict erupted. So where do we draw the line? The thing is, many microstates don’t see military independence as practical—or necessary. Their security is outsourced. Italy guards Vatican City’s borders. France protects Monaco. And that’s perfectly legal under international law.
Standing Armies vs. Defense Agreements: A Modern Workaround
Several countries have abolished their militaries entirely. Costa Rica did it in 1948 after a civil war—burned the old barracks, turned them into museums. Today, they spend more on environmental protection than on armed forces (which they don’t have). Their defense? Diplomacy, and an implicit understanding that the U.S. and regional allies would intervene if needed. And that’s exactly where conventional metrics fall apart. Is a nation without soldiers “weak”? Not necessarily. It’s a strategic choice.
Microstates and the Illusion of Military Power
Think of Andorra. Nestled in the Pyrenees, co-ruled by the President of France and the Bishop of Urgell. Population: 77,000. Military? None. They have a 12-person ceremonial unit and a small police force. Their defense is handled by, guess who—France and Spain. Same with Liechtenstein. Abolished its army in 1868 after spending less than $1,200 on defense the year before (inflation-adjusted, that’s pocket change). They haven’t looked back. So technically, their army size is zero—which is smaller than the Vatican’s 137. But data is still lacking on how many nations truly have no armed personnel whatsoever.
The Vatican’s Swiss Guard: Ceremony or Combat Force?
Numbering 137, the Pontifical Swiss Guard is the smallest active military unit in the world. Recruited from Swiss Catholic men under age 30, they must have completed basic training in the Swiss Armed Forces. They carry halberds, wear Renaissance-era uniforms (bright yellow, red, blue), and guard the Pope. But—and this is important—they’re not equipped or trained for modern warfare. Their last real battle? 1527, during the Sack of Rome, where 147 guards died protecting Pope Clement VII. Today, their main duties involve protocol, crowd control, and standing very still in St. Peter’s Square.
Are they a real army? In legal terms, yes. The Vatican considers them a sovereign military corps. But realistically? They couldn’t defend Vatican City from a determined attack. Their strength is symbolic. And that’s okay. The real protection comes from Italy’s Carabinieri, who patrol the surrounding area. The Swiss Guard is more like an elite ceremonial unit—akin to the Queen’s Guard in London, except they’re constitutionally recognized as military. Which raises a question: if the guard can’t fight a war, does it even count?
Costa Rica vs. Iceland: Who’s Truly Unarmed?
Costa Rica abolished its military in 1948. Since then, it’s invested in education and healthcare—spending nearly 7% of GDP on the former. That’s higher than most NATO countries spend on defense. They have no air force, no navy, no tanks. Just a national police force with around 15,000 officers, some of whom are trained in counter-narcotics and border patrol. But no battlefield weapons. No military ranks. No chain of command outside law enforcement.
Iceland’s situation is different. No standing army. But they host a NATO air-policing mission at Keflavík. The U.S. and other allies rotate fighter jets there. They also have a 40-person armed unit—the Iceland Crisis Response Unit—that’s deployed to UN peacekeeping missions. So while they don’t have a traditional army, they’re integrated into a larger defense ecosystem. Costa Rica isn’t. It refuses foreign military bases. It even turned down U.S. offers during the Cold War. That independence is deliberate. And that’s exactly where the nuance lies: being unarmed isn’t weakness; it’s policy.
And that’s not to romanticize it. In 1973, Honduras invaded Nicaraguan territory. Costa Rica had no means to respond militarily. They appealed to the OAS. The issue was resolved diplomatically. But what if it hadn’t been? We’re far from it, but the risk exists. Still, Costa Rica’s model has inspired Panama (abolished army in 1990) and Haiti (officially no military since 1995, though it’s complicated).
Monaco, Liechtenstein, and the Art of Strategic Minimalism
Monaco maintains 285 active military personnel—the smallest official standing army after the Vatican. But their role? Protecting the Prince and assisting police during emergencies. They’ve never fought a war. Their “military budget”? Around €27 million annually—less than what the U.S. spends on a single F-35 jet. Yet Monaco is one of the safest countries on Earth. Why? Location. Surrounded by France, which is responsible for its defense under treaty. Same for Liechtenstein. Population: 39,000. Army: 0. But they have a 120-person national emergency organization that could mobilize in crisis. It’s a bit like keeping a fire extinguisher in the kitchen—not an arsenal, but not completely helpless.
Andorra is similar. A joint French-Spanish defense agreement means they don’t need soldiers. Their entire defense expenditure? Approximately $0. That said, they did form a cyber-defense unit in 2021—12 specialists monitoring digital threats. Modern warfare isn’t just tanks and trenches anymore.
Who Really Has the Smallest Army? A Comparison
Let’s break it down numerically. Vatican City: 137 (Swiss Guard). Monaco: 285. Liechtenstein: 0. Andorra: 0. Iceland: 0 (but 100 paramilitary). Costa Rica: 0 (but 15,000 armed police). So technically, Liechtenstein and Andorra have smaller armies than the Vatican. But most rankings don’t list them because they’re not sovereign military entities in the traditional sense. The CIA Factbook lists Vatican City as the smallest because it’s the only one with a formal, recognized military unit.
To give a sense of scale: San Marino has 45 active-duty soldiers (Guardia di Rocca) and a reserve of 80. They’ve never been at war. Their “military parades” are more like village festivals. Yet they’re constitutionally sovereign. So why isn’t San Marino on the list? Probably because people don’t think about this enough. Size isn’t just about numbers—it’s about recognition, structure, and function.
Frequently Asked Questions
Can a country survive without an army?
You bet. Costa Rica has for over 70 years. So has Iceland. Their survival hinges on diplomacy, regional stability, and alliances. NATO protects Iceland. The U.S. and OAS back Costa Rica. But this only works in stable geopolitical climates. During the Cold War, it was risky. Today? Less so. Still, experts disagree on whether this model is exportable to conflict-prone regions.
Does the Vatican have the smallest army?
Yes, if you count only formal, standing military units. The Swiss Guard is recognized under international law as the Vatican’s armed force. But if you include countries with zero military personnel, then Liechtenstein, Andorra, and Costa Rica technically have smaller armies—namely, none. The distinction matters.
Why don’t some countries have armies?
For many, it’s a mix of history, cost, and philosophy. Costa Rica abolished theirs after a civil war, choosing peace over militarism. Liechtenstein couldn’t afford one in the 19th century—why spend on soldiers when you’re sandwiched between Switzerland and Austria? And for microstates, it’s practical: outsourcing defense to neighbors is cheaper and safer than building a force from scratch.
The Bottom Line: Size Isn’t Strength
The smallest army isn’t just a trivia answer—it’s a window into how nations define security. The Swiss Guard may be tiny, but its cultural weight is massive. Costa Rica has no tanks, yet it’s more stable than many armed neighbors. The problem is, we still measure power by troop counts and missile silos, not by healthcare access or education levels. I find this overrated—the idea that a country must have an army to be sovereign. Look at Japan: constitutionally pacifist, yet backed by 50,000 U.S. troops and one of the most advanced self-defense forces on the planet. Or Singapore: 51,000 active personnel, but a GDP larger than most Middle Eastern armies. Strength isn’t just in numbers.
So who has the smallest army? Technically, it’s Liechtenstein or Andorra—zero personnel. But officially, it’s the Vatican. And that’s because definitions matter more than raw stats. If you’re building a model, my advice: look beyond the headline number. Ask who protects the nation. Ask what “defense” really means. Because in a world where cyberattacks and pandemics are the new frontlines, a halberd-wielding guard in a colorful uniform might be the least relevant measure of all. Honestly, it is unclear where we’ll draw the line next—but you can bet it won’t be in the parade grounds.