WASHINGTON — May 12, 2026 : The United States Navy is set to begin development of a new Long Range Anti-Submarine Warfare Weapon (LRAW) under its Fiscal Year 2027 Research, Development, Test and Evaluation (RDT&E) budget, according to newly released budget documentation. The program is intended to expand the Navy’s long-range anti-submarine warfare capability and eventually replace or supplement existing vertically launched anti-submarine weapons currently in service.
The LRAW program has been approved as a new-start initiative for FY2027 and will receive an initial allocation of $11.423 million. The funding will support preliminary design activities, engineering work, production of test articles, and modifications to existing Vertical Launch Anti-Submarine (VLA) rounds for testing and evaluation.
Navy Seeks Greater Anti-Submarine Engagement Range
The U.S. Navy currently relies on the RUM-139C Vertical Launch Anti-Submarine Rocket (VL-ASROC) as its primary ship-launched long-range anti-submarine warfare weapon. The system uses a rocket booster and guidance package to deliver a lightweight torpedo, including the Mk-46 or Mk-54, to a designated drop location before the torpedo enters the water by parachute and autonomously searches for enemy submarines.
According to the FY2027 budget justification documents, the Navy identified insufficient operational range in current VLA systems as a major capability gap. Publicly available data places the RUM-139C’s maximum operational range at approximately 10 to 12 nautical miles, or roughly 19 to 22 kilometers.
The Navy assessed that evolving undersea threats now require surface combatants to engage hostile submarines from significantly greater stand-off distances. Modern adversary submarines are increasingly equipped with advanced sensors and long-range heavyweight torpedoes, allowing them to threaten surface ships from beyond the effective engagement range of existing anti-submarine rockets.
The Navy also noted that the active inventory of RUM-139 missiles is declining. Budget documents stated that limited maintenance funding has reduced the number of missiles being sustained in operational service, increasing the requirement for a modern replacement capable of future mass production.
LRAW Expected to Build on Existing VL-ASROC Concept
Although the final configuration of the weapon remains under development, defense analysts expect LRAW to retain a similar operational concept to the current VL-ASROC system. The new weapon is anticipated to use rocket-assisted delivery to transport an acoustic-homing lightweight torpedo, likely the Mk-54, to substantially greater distances before deployment into the water.
The Navy has not yet disclosed details regarding the weapon’s propulsion system, target range objectives, guidance architecture, or planned operational timeline. However, the program is expected to significantly increase the anti-submarine reach of future U.S. surface combatants operating in contested maritime regions.
Program Signals Deeper AUKUS Integration
One of the most notable elements of the LRAW program is its apparent integration with the AUKUS trilateral security partnership involving the United States, United Kingdom, and Australia.
The FY2027 development schedule for LRAW includes a reference to an “AUKUS RWG/TLR” review, likely referring to an AUKUS Requirements Working Group or Top Level Requirements review process. The inclusion suggests the weapon is being designed from the outset to meet interoperability requirements across all three allied navies.
LRAW is expected to fall under AUKUS Pillar 2, which focuses on joint development and integration of advanced military technologies. Undersea warfare capabilities remain one of the primary focus areas within the Pillar 2 framework.
MK-41 Compatibility Could Enable Allied Fleet Integration
Compatibility with the MK-41 Vertical Launching System is expected to play a central role in the program’s multinational integration potential. The U.S. Navy and Royal Australian Navy already operate the MK-41 system extensively across multiple surface combatants, while the British Royal Navy plans to deploy strike-length MK-41 launch cells aboard its future Type 26 and Type 31 frigates.
The United Kingdom has previously issued requests for information regarding long-range anti-submarine warfare weapons for future MK-41-equipped surface vessels. If LRAW maintains compatibility with the same launch architecture used by current VL-ASROC systems, integration across allied fleets could be achieved with relatively limited structural modifications.
The Navy has not released additional technical information regarding the weapon at this early stage of development. However, the program represents a broader effort to restore and expand long-range organic anti-submarine warfare capability for U.S. and allied naval forces amid increasing undersea competition in strategically important maritime regions.
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