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Japan has unveiled a new railgun, marking a significant advancement in its defense technology. This electromagnetic weapon is designed to launch projectiles at high speeds without the need for traditional explosives, offering potential benefits in terms of cost, safety, and performance. The development reflects Japan's growing focus on cutting-edge military capabilities and its commitment to enhancing national security in response to regional tensions. While still in the testing phase, the railgun could pave the way for future applications in both land-based and naval defense systems.Although the U.S. Navy's costly and ambitious railgun project was terminated in 2021 following 15 years of development and $500 million in expenditures, Japan has managed to design and test its own ship-based railgun system.
-The Japan Maritime Self-Defense Force (JMSDF) conducted its first railgun firing from a warship in October 2023 and has since made progress by overcoming major technical challenges, such as rapid barrel wear.
-This positions Japan ahead of the U.S. in the development of this cutting-edge technology, which launches non-explosive projectiles at hypersonic velocities and is considered a crucial future defense measure against hypersonic missiles from China and Russia.
Japan Possesses Railguns: The United States Lacks This Technology
Merriam-Webster defines “rail gun”Either "rail gun" or "railgun" is acceptable and can be described simply as "an electromagnetic catapult built to launch projectiles at very high velocities."
Meanwhile, Michael Anissimov from the All the Science websiteadds more detail, explaining that "A rail gun is made up of two securely mounted parallel metal rails linked to an electrical power source. A conductive projectile is positioned between the rails, which closes the circuit."
The projectiles launched by these weapons are not explosive; explosives aren't needed for such uses because the immense speed alone—reaching up to Mach 7 in certain cases—creates a powerful kinetic force upon impact.
In other words, a railgun should not be mistaken for traditional railway guns like the800 mm (31.5 in) Heavy Gustav Railway GunAlso known as "Dora," the Heavy Gustav Cannon Railway Gun was constructed by Nazi Germany during World War II (and while these weapons were undeniably powerful and impressive in their own way).
Surprisingly, Japan, which allocates only 2 percent of its GDP to defense, possesses a railgun. (The Trump Administration urged Japan to increase its defense expenditures to 3.5 percent)was not well-received.)
It should be acknowledged, however, that in December, theCabinet of Japan did approve the country’s largest-ever defense budgetfor the upcoming fiscal year, amounting to 8.7 trillion yen—equal to $54.8 billion—an increase of 9.7 percent compared to the prior year, representing 13 consecutive years of budget increases for the Japan Self-Defense Force [JSDF]
Meanwhile, the U.S. Navy, which has engaged in numerous conflicts during the post–World War II period (unlike Japan, which has not participated in any wars over the same span), does not possess a railgun.
Why this dichotomy?
Details of Japan’s Railgun
The primary branch responsible for Japan's railgun program is its Navy, specifically theJapan Maritime Self-Defense Force (JMSDF)The railgun was initially developed or introduced.Discharged from a Japanese naval vesselin October 2023.
Fast-forwardAs of April 18 this year, the Japan Maritime Self-Defense Force (JMSDF) released a photo showcasing its advanced railgun, which was being tested aboard the trial vessel JS Asuka.
A notable accomplishment during the testing was successfully addressing major challenges, including rail erosion caused by repeated firing (exceeding 120 rounds).
This workout was clearly enabled by transitioning from copper as the original barrel material to another combination of (unspecified) metals and substances.
Prior to this breakthroughIt was commonly accepted that railguns required maintenance after almost every use, making them less practical compared to traditional projectile weapons.
Even more remarkably, this extended barrel life was accomplished with a relatively modest budget of approximately $6.5 million.
Japan's development of railguns is carried out by theGround Systems Research Center(GSRC), a section of theAcquisition, Technology & Logistics Agency (ATLA)which initiated comprehensive railgun research in 2016 and continued it through 2022, investing 1 billion yen throughout the process.
By every measure, it was a worthwhile investment. If and when it enters official operational service, it will become tasked with defending against Hypersonic missiles developed by China and Russia.
Current State of the U.S. Navy's Railgun Initiative (Or the Absence of It)
Digging deeper, an article by James Keller from Task & Purpose reveals that the US Navy's railgun initiative wasFormally pronounced deceased in July 2021given 'budget limitations, difficulties in integrating combat systems, and the expected technological advancement of alternative weapon concepts,'accordingto a statement given to Military.com.”
Researchers from the US Navy dedicated 15 years and $500 million to research and testing. However, they failed to resolve the challenging issues that their Japanese equivalents had overcome in under half the time, using just slightly more than 1 percent of the funds allocated.
Maybe the USN can utilize insights gained from Japan and combine efforts to create railguns together in the future.
A further technical hurdle in railgun development is the immense power demand, requiring around a million amperes of current, which makes it extremely challenging to create portable versions.
This would, at a minimum, represent a valuable objective for the Japan-U.S. alliance in light of their shared membership inThe Quad.
Yet, neither U.S. President Donald Trump norU.S. Secretary of Defense Pete Hegsethis currently a top priority.
Christian D. Orr is a defense specialist.
Christian D. Orr serves as a Senior Defense Editor. He previously worked as an Air Force Security Forces officer, a Federal law enforcement officer, and a private military contractor, with deployments in Iraq, the United Arab Emirates, Kosovo, Japan, Germany, and the Pentagon. Chris earned a B.A. in International Relations from the University of Southern California (USC) and an M.A. in Intelligence Studies, specializing in Terrorism Studies, from American Military University (AMU).
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