South Korea's first missile development program was the Baekgom, or White Bear, project. From the Baekgom missile born of that effort to the Hyunmoo-5 now drawing attention from the global defense industry, the country's missile development history spans 48 years. It began in 1972, when President Park Chung-hee, who championed self-reliant national defense, secretly ordered the development of a surface-to-surface missile with a 200-kilometer range capable of striking Pyongyang.
Following Park's directive, the Agency for Defense Development (ADD) drew up the Baekgom project plan in 1974 and began missile development. The Baekgom missile, designated NHK-1, completed a successful flight test at the Anheung test site in September 1978, making South Korea the world's seventh missile-developing nation. At that year's Armed Forces Day parade, the country's first ballistic missile was unveiled to the public.
The NHK-1 Baekgom, the first domestically built short-range surface-to-surface ballistic missile, has evolved through continuous development into the Army's mainstay Hyunmoo ballistic missile series and ranks among South Korea's signature weapons systems. It was built by reverse-engineering the MIM-14 Nike Hercules (NH), the first anti-ballistic missile developed by the United States, which could carry a tactical nuclear warhead.
The Baekgom missile, however, never reached deployment after its first successful test launch. Following Park's death in October 1979, the incoming Chun Doo-hwan government scrapped the project. Ironically, the Chun government revived the stalled program in 1983 after North Korea's bombing at the Aung San Mausoleum in Burma.
The ADD set out to upgrade the Baekgom, consolidating the propulsion system into a single unit and fitting an inertial navigation system to improve accuracy. The resulting missile, known as the NHK-2 or K-2, became the Hyunmoo-1. Rooted in the Baekgom project, it closely resembled its predecessor in appearance, with a range of 180 kilometers and a 500-kilogram warhead.
The Baekgom's single-stage propulsion, however, gave way to a two-stage design in the Hyunmoo-1. Where the Baekgom used four solid-fuel rockets as its first stage, the Hyunmoo-1 consolidated them into a single, larger rocket. It was the first ballistic missile South Korea deployed operationally, entering service in 1986. The military produced and fielded some 200 units. All have since been retired following the introduction of the successor Hyunmoo-2A.
In 1990, under President Roh Tae-woo, South Korea reached an agreement with the United States pledging not to develop "any rockets, including those for military, scientific or industrial use." Only missiles with a range of 180 kilometers and a warhead of 500 kilograms or less were permitted. After the South Korea-U.S. missile guidelines were revised to raise the range cap from 180 to 300 kilometers, the Hyunmoo-2A emerged with a 300-kilometer range and a 500-kilogram warhead, becoming one of the strategic ballistic missiles now in service.
Rumors long circulated that the Hyunmoo-2 had been developed and deployed, but it was not seen publicly until April 2012, when the Defense Ministry revealed it after North Korea launched its Unha-3 rocket. The Hyunmoo-2A, which completed its first successful test launch in April 1999, resembles Russia's Iskander in appearance and uses a single-stage propulsion system.
Standing 6 meters tall with a diameter of 80 centimeters, the Hyunmoo-2 is operated from container-type launchers, giving it operational flexibility and the ability to relocate after firing. Its warhead can carry hundreds of submunitions, with enough firepower to devastate an area equivalent to dozens of soccer fields in an instant. The Hyunmoo-2B, an accuracy-improved version of the 2A, began deployment in 2009.
A second revision of the South Korea-U.S. missile guidelines in 2012 further eased limits on range and warhead weight, and the Hyunmoo-2B now operates with a 500-kilometer range and a 1-ton warhead. In June 2015, the Hyunmoo-2C, with an 800-kilometer range and a 500-kilogram warhead, completed its first successful test launch. It is distinguished by canards, or auxiliary fins, mounted on the warhead section.
The 2012 revision adopted what is known as a trade-off approach. Under it, a South Korean ballistic missile with an 800-kilometer range was limited to a 500-kilogram warhead, a 500-kilometer range to 1 ton, and a 300-kilometer range to 2 tons. Two further revisions followed, and by July 2017 only the 800-kilometer range cap remained, with warhead weight unrestricted.
The Hyunmoo-3 is a cruise missile rather than a ballistic one. Development began in the 1990s, and the Hyunmoo-3A was first deployed in 2006. Its existence became known when the Defense Ministry first told reporters it was developing the ground-launched cruise missile with a 500-kilometer range. The South Korea-U.S. missile guidelines placed no range limits on cruise missiles, including unmanned aircraft.
Russian technology is said to have been used in the Hyunmoo-3A. Successive upgrades led to the completion of the Hyunmoo-3C in 2010, making South Korea the fourth country after the United States, Russia and Israel to possess a cruise missile with a 1,500-kilometer range. The Hyunmoo-3C, which entered service in 2012, has a range of 1,500 kilometers.
In sum, the Hyunmoo-3 series ranges from 500 kilometers for the 3A to 1,000 kilometers for the 3B and 1,500 kilometers for the 3C. The Hyunmoo-3D, which remains under wraps, is said to reach 3,000 kilometers. The Hyunmoo-3 costs 4 billion won per unit, somewhat more than the $1.5 million (about 2 billion won) price of the U.S. Tomahawk.
Notably, the Hyunmoo-3 boasts the longest range of any missile in the South Korean military's inventory. The Navy operates the missile under the name Haeseong. Ship-to-surface variants are designated Haeseong-2, and submarine-launched versions Haeseong-3. Able to be fired from surface ships or submarines and equipped with a long range, it is a weapons system that poses a threat to neighboring countries in Northeast Asia.
The Hyunmoo-4, whose appearance has yet to be revealed, is among the military's ultimate weapons. Development began after the 2017 revision of the missile guidelines lifted warhead weight limits, and mass production is now said to be in preparation. Its defining feature is destructive power, with all warhead weights measured in tons. The Hyunmoo-4 can penetrate 24 meters of reinforced concrete, placing it among the most capable bunker busters.
The Hyunmoo-4-1 variant is said to carry a warhead weighing more than 2.5 tons, enough destructive power to devastate more than 100 soccer fields simultaneously. The Hyunmoo-4 has reportedly been developed in three configurations: the surface-to-surface 4-1, the ship-to-surface 4-2 and the submarine-to-surface 4-4.
In September 2021, the South Korean military successfully conducted an underwater ejection test of a submarine-launched ballistic missile designated Hyunmoo-4-4 from the submarine Dosan Ahn Chang-ho. The test of the SLBM, which has a range of 500 kilometers, made South Korea the world's eighth country to launch one and marked the first test of an indigenously developed non-nuclear SLBM anywhere in the world.
The most powerful weapon in the military's current arsenal is the Hyunmoo-5, the culmination of the Hyunmoo series. Dubbed the "monster missile," its exact specifications have not been disclosed, but it is classified as a near-nuclear-grade weapon, with analysts saying its deployment would allow a powerful conventional response to a North Korean nuclear attack. That is why it is described as the most capable bunker buster in existence.
For that reason, the military classifies the Hyunmoo-5 as an overwhelming means of massive punitive retaliation against North Korean territory in a contingency. Its penetrating power is sufficient to destroy command and strategic targets buried more than 100 meters underground anywhere in North Korea. That is why some assess it as having the force of a small tactical nuclear weapon. Footage of a test launch was first released at the Armed Forces Day ceremony in October 2022.
The Hyunmoo-5's warhead is said to weigh a full 8 tons. Because the military focused on increasing warhead weight to maximize explosive power, the figure is more than triple that of the Hyunmoo-4. Detonating dozens of them at once would match the force of a low-yield nuclear backpack device. The maximum explosive power of existing conventional weapons is around 10 tons.
The Hyunmoo-5's strength lies in climbing to an altitude of 1,000 kilometers before plunging into its target at speeds exceeding Mach 10. The warhead itself is powerful, but the kinetic energy generated by the ultra-high-speed descent creates an artificial earthquake capable of devastating North Korean underground facilities. Military experts describe it as a conventional weapon that delivers nuclear-level force.
