Singapore frigate spotted with Blue Spear missiles in first visual confirmation

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New imagery provides what appears to be the first visual confirmation that Singapore has begun installing the Blue Spear surface-to-surface missile, also known as the 5G SSM, on its Formidable class frigates. The appearance of Blue Spear aboard RSS Steadfast offers a first glimpse of a key element of Singapore’s broader naval modernization effort . The installation also gives the Israel-Singapore missile joint venture a high-profile reference point as it seeks to market Blue Spear to other operators looking to replace their aging Harpoon fleets.

In photos shared with TWZ by Koji Inoue ( @kojiinet on X), a container for the missile is clearly visible aboard Steadfast , the third ship of Singapore’s six Formidable class frigates, offering what is believed to be the first publicly available photographic evidence of the weapon actually fitted to one of the ships.

A container for the Blue Spear missile aboard Steadfast , the third ship of Singapore’s six Formidable class frigates. Koji Inoue/@kojiinet

The appearance of Blue Spear on Steadfast comes as the frigate prepares to open its doors to the public during guided tours at the Tokyo International Cruise Terminal on August 21-22.

東京国際クルーズターミナルに到着した、シンガポール海軍のフリゲート、RSS Steadfast。よくよく見ると、SSM 搭載用レセスの後端に何かある…

＿人人人人人人人人人＿

＞　バスケのゴール　＜

￣Y^Y^Y^Y^Y^Y^Y^Y^Y^ https://t.co/GhYyqoTa8t pic.twitter.com/eBY0AukHCx

— 井上孝司 Koji Inoue (@kojiinet) August 19, 2026

← 東京西航路に入航した RSS Steadfast、その後方で羽田空港から離陸する ANA の 787 (たぶん)

東京港で活躍するゴミ回収船→ pic.twitter.com/ooUmwmBoq3

— 井上孝司 Koji Inoue (@kojiinet) August 19, 2026

Singapore had previously disclosed that Blue Spear would replace the class’s legacy Harpoon anti-ship missile as part of a mid-life upgrade (MLU). However, until now, confirmation of the weapon’s installation has largely come through official statements and industry reporting.

The Republic of Singapore Navy (RSN) first introduced the RGM-84 Harpoon for its Sea Wolf class missile gun boats (MGB), when they were upgraded in the late 1980s. The Victory class multi-purpose corvettes continued using the Harpoon when they were introduced in the 1990s, and the same missile was then installed on the Formidable class when it came online from 2005 onwards.

The Republic of Singapore Navy Victory class corvette RSS Valiant , with angled Harpoon launchers fitted. U.S. Navy photo by Mass Communication Specialist Seaman Michael Colemanberry/Released

Each of the Formidable class could carry as many as 24 Harpoons, if required, with capacity for six quad packs on the missile deck. The likelihood is that the same 24-mille capacity will be retained for Blue Spear, although as configured for its Japan visit, Steadfast has the mimimum fit, with one quad launcher.

Singapore first revealed plans to equip the frigates with Blue Spear in 2023, when a senior Republic of Singapore Navy officer outlined the intended missile upgrade during an interview with Janes ahead of the IMDEX exhibition. Then-Commander of the RSN’s First Flotilla, Colonel Ng Kok Yeng Daniel, outlined the plans during the exhibition preview.

RSS Steadfast in Tokyo. Koji Inoue/@kojiinet

The MLU is considerably broader than the missile replacement. Singapore’s Ministry of Defense has said the programme will also introduce upgrades to the frigates’ combat management, communications, and engineering systems.

Blue Spear is produced by Proteus Advanced Systems, a joint venture between Israel Aerospace Industries (IAI) and Singapore’s ST Engineering. The weapon traces its development lineage to the Israeli Gabriel family of anti-ship missiles, but is intended to provide a modern, multi-role precision-strike capability.

The missile was publicly displayed for the first time at the Singapore Airshow 2022, soon after a contract had been signed with the Estonian Defense Forces to meet its coastal anti-ship missile requirement. In this form, the missile is fired from a truck-based launcher .

An infographic on the Blue Spear published by the Estonian Defense Forces. EDF via X

Blue Spear was also proposed to the U.K. Royal Navy as a Harpoon successor, under the name Sea Serpent . However, the Interim Surface-to-Surface Guided Weapon (I-SSGW) requirement was ultimately won by the Kongsberg Naval Strike Missile (NSM), a weapon also used by the U.S. Navy, among others.

According to specifications released by Proteus, Blue Spear is a subsonic missile with a range of around 180 miles. It is designed for beyond-line-of-sight engagements and can be employed against both maritime and land targets.

The turbojet-powered weapon incorporates a radio-frequency seeker and guidance system designed to operate in complex electromagnetic environments, including scenarios in which an adversary is employing electronic countermeasures. The missile uses ‘advanced algorithms’ for target discrimination and can be launched in fire-and-forget or fire-and-update modes. Proteus has said in the past that is has considered installing an imaging infrared seeker, if required.

Blue Spear is designed to engage moving targets and can dynamically modify its flight path during an engagement. Its low-level, sea-skimming approach is intended to make detection and interception more difficult for defending forces.

A full-size model of the Blue Spear surface-to-surface missile, also known as the 5G SSM. Roy Choo

For the Republic of Singapore Navy, the transition from Harpoon to Blue Spear brings a substantially longer-range strike capability to a class of ships that remains a central component of the country’s surface fleet. The Harpoon has a range of around 130 miles and, in the RGM-84C form used by the RSN, lacked a land-attack capability. In the anti-ship role, the missile provides a critical capability for Singapore, considering the dense littoral region and the strategic strait that it sits on.

As well as the pacing maritime threat posed by China , there other potential adversaries in the region are also investing in new ship-launched surface-to-surface missiles, as Roy Choo, a defense journalist and TWZ contributor explained:

“The introduction of the Blue Spear will help the Singapore Navy keep pace with the growing lethality and range of new and upgraded anti-ship missiles being introduced across the region. Indonesia has the Russian-made Yakhont on the Ahmad Yani class frigates and will get the Turkish-made ATMACA missile soon, among the many types it operates. Malaysia was supposed to introduce the Naval Strike Missile on its littoral combat vessels but is now searching for a replacement.”

Test launch of a Yakhont missile from the Indonesian Navy frigate KRI Oswald Siahaan in April 2011. Indonesian Defense Ministry

The new missile installation also points to the broader transformation underway across Singapore’s aging frigate fleet. With new missiles being introduced as part of a wider package of upgrades, this effort is intended to keep the Formidable class relevant as Singapore faces an increasingly sophisticated maritime security environment.

Meanwhile, Singapore is building a new class of drone motherships, or Multi-Role Combat Vessels (MRCV), the largest and most complex ships the RSN has ever operated. Blue Spear is provided an an option for these hulls, with at least four mounting points, exploiting their modular design.

The Multi-Role Combat Vessel (MRCV) for the Republic of Singapore Navy. Singapore Ministry of Defense

The MRCVs will form the cornerstone of the navy’s fleet modernization effort , alongside two additional Type 218SG submarines in addition to the previous four, and the Boeing P-8A Poseidon maritime patrol aircraft, which will also provide a significant capability boost .

The Blue Spear program also underscores a decades-old, largely low-profile defense-industrial relationship between Israel and Singapore, one that has produced cooperation across some of the city-state’s most sensitive and advanced military capabilities.

Among the very advanced arms acquired by Singapore from Israel is the Gulfstream G550 Conformal Airborne Early Warning (CAEW) aircraft, four of which were bought from IAI. Singapore’s Block 52 F-16s are equipped with Israeli-supplied equipment, including avionics, electronic warfare kit, and air-to-air missiles . There have long been rumors that Singapore acquired Merkava main battle tanks from Israel, but these vehicles have never been publicly seen.

Singapore has confirmed that it’s upgraded F-16s will use the Python V AAM. While it has been rumoured for almost 20 years they were could use Python IV, they have never been seen although RSAF F-16s have been seen with Python training missiles disguised as AIM-9Ps pic.twitter.com/VU686jlFph

— Mike Yeo 杨启铭 (@TheBaseLeg) June 29, 2023

Now, after sales to Estonia and Singapore, Proteus is pitching Blue Spear as a Harpoon replacement for other nations, with the company eyeing potential customers across Southeast Asia, Europe, and Latin America.

Estimates for the number of Harpoon missiles built range from 6,400 to around 8,000, depending on source. The missile has been ordered by 30 countries, so there is potentially a very significant market for a new weapon in this class.

For the time being, the arrival of Blue Spear aboard Steadfast underscores the scale of Singapore’s ongoing naval modernization, extending the reach and flexibility of one of the RSN’s core surface combatants. As the service introduces new frigate weapons alongside MRCVs, submarines, and maritime patrol aircraft, the missile also offers a glimpse of the increasingly long-range and networked force Singapore is building.

With thanks to Roy Choo.

Contact the author: thomas@thewarzone.com

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