Login/Logout

*
*  

ACA’s journal, Arms Control Today, remains the best in the market. Well focused. Solidly researched. Prudent.

– Hans Blix,
former IAEA Director-General

Examining the Flawed Rationale for a New Nuclear Air-Launched Cruise Missile
Share this

Volume 8, Issue 2, June 12, 2016

The debate about the necessity and affordability of the Obama administration’s half trillion dollar plan to modernize the nuclear triad of land-based missiles, submarine-launched missiles, and long-range bombers–and their associated warheads and supporting infrastructure–continues to escalate.

The mammoth costs of nuclear modernization prompted Senate Armed Services Committee chairman John McCain (R-Ariz.) to ask on May 19 at the Brookings Institution: “it is very, very, very expensive... Do we really need the entire triad, given the situation?”

President Barack Obama has acknowledged that existing U.S. and global nuclear weapons capabilities already provide more than enough nuclear killing power. Yet, his administration has to date pursued a costly, “all-of-the-above” plan to maintain and upgrade U.S. nuclear forces at force levels that exceed nuclear deterrence requirements.

One of the most controversial pieces of this approach is the Air Force’s proposal to build a new fleet of roughly 1,000 nuclear-capable air-launched cruise missiles (ALCMs) and refurbish the warhead for the weapon. The replacement is known as the long-range standoff cruise missile, or LRSO.

Senator Ed Markey (D-Mass.) filed an amendment to the fiscal year (FY) 2017 national defense authorization act that would delay development of the new cruise missile and warhead by one year to allow further consideration of the programs. While the Senate is unlikely to debate or vote on the amendment, the Senate and House of Representatives could consider amendments on the issue again later this month when each body takes up the FY 2017 defense appropriations bill.

For its part, the Obama administration appears content to pass on the growing fiscal challenge posed by its nuclear modernization project to its successor.

However, Ben Rhodes, the assistant to the president and deputy national security advisor for strategic communications, said at the Arms Control Association annual meeting on June 6, that the President recognizes the enormous budget challenge posed by the plans and will continue to review them “as he considers how to hand the baton off to his successor.”

Regardless of what happens during the remainder of the Obama administration, the next president will likely face a number of increasingly urgent questions about the modernization effort, including its need, affordability, opportunity costs, impact on global security, and more.

In other words, the debate about modernization, and in particular the new cruise missile, has just begun.

The Defense Department and supporters of replacing the nuclear ALCM in Congress and the think tank community have circulated a number of materials in response to Markey’s amendment and other efforts to raise doubts about the rationale for the new missile.

The following is a rebuttal to some of the top arguments made in favor of the program.

A closer examination of the issue makes it clear that the LRSO is redundant, lacks a unique mission, could have a destabilizing effect, and is not worth its estimated $20-$30 billion acquisition cost.

The LRSO Is Not Needed to Maintain the Air-Leg of the Triad

Proponents argue that air-launched cruise missiles extend the range of strategic bombers and complicate an adversary’s air defense problem. The LRSO will ensure the country has an air-leg of the triad that can penetrate enemy airspace as adversaries enhance and expand their air defense capabilities, they say.

It is important to remember that the United States first fielded a nuclear ALCM in the early 1980s at a time when the country did not have stealth bombers or advanced conventional cruise missiles and sought an additional nuclear system with which to deter and impose costs on the Soviet Union. None of these conditions exist today.

According to Andrew Weber, former assistant secretary of defense for nuclear, chemical, and biological matters, had the United States procured even half of the 132 B-2 bombers it had originally planned to build during the late 1980s and early 1990s (the Air Force ultimately bought 21), the Pentagon would have retired the current ALCM and removed the B-52H from the nuclear mission years ago.

The range of America’s existing strategic bombers is being extended by increasingly advanced long-range conventionally-armed air-launched cruise missiles. The planned introduction of 80-100 B-21 strategic bombers, which will be armed with the modernized B61 mod 12 gravity bomb, conventionally armed cruise missiles such as the JASSM-ER, and electronic warfare capabilities for air defense suppression, will further enhance the range of the bomber leg.

Together these improvements will make the bomber leg of the triad much more formidable than it is today. The B-21 is projected to be able to penetrate enemy airspace for decades after its initial fielding in the mid-2020s, which begs the question of why a new ALCM is urgently needed now. Even if the survivability of the B-21 is called into question in the future, the Pentagon has yet to demonstrate that the LRSO, which is being procured at the same time as the B-21, will be inherently more survivable or that a B-21 armed with conventional air-launched cruise missiles won’t be able to blow holes in air defenses. If the Air Force believes the stealth of the B-21 could be compromised soon after it is deployed, the service shouldn’t procure it in the first place.

The LRSO Is Not Needed to Deter Limited Nuclear Escalation, Nor Should We Want It for Waging Limited Nuclear War

Proponents argue that new air-launched cruise missiles would provide low-yield nuclear war-fighting options for responses to limited adversary attack, which is important for escalation control and maintaining a credible deterrent.

In reality, U.S. nuclear capabilities would remain highly credible and flexible even without a nuclear ALCM. The arsenal includes other weapons that can produce more “limited” effects, most notably the B61 gravity bomb. Moreover, intercontinental ballistic missile (ICBM) or submarine-launched ballistic missile (SLBM) warheads could be configured to produce limited effects at a lower cost than the LRSO and its warhead, if necessary.

Regardless, has the U.S. intelligence community produced an assessment showing that failing to replace the current ALCM would increase the risk of limited adversarial nuclear use? Under what scenario has the intelligence community concluded that an adversary might believe the United States would be self-deterred from using a higher-yield ICBM or SLBM in response to limited nuclear use?

More importantly, the notion that the use of nuclear weapons can be fine-tuned to carefully control a nuclear war is very dangerous thinking. It is highly unlikely that an adversary on the receiving end of a U.S. nuclear strike would (or could) distinguish between a large warhead and a small warhead. The fog of war is thick. The fog of nuclear war would be even thicker. Large or small, nuclear weapons are extremely blunt instruments, both in terms of their destructive power and the taboo associated with the fact they have not been used in 70 years.

Finally, under what scenario could one ALCM or LRSO reliably circumvent the most sophisticated adversarial air defense capabilities and destroy a target that a B-21-borne gravity bomb or conventional cruise missile could not? If such a scenario does not exist, and the United States needed to launch more nuclear cruise missiles to ensure penetration, how would such a strategy not unavoidably escalate the conflict?

The LRSO Would Be a Costly “Hedge on a Hedge”

Proponents argue that ALCMs (and later the LRSO) complement the nuclear triad and will provide an important and rapidly uploadable hedge against technical problems with the sea and ground based legs of the triad. They also argue that the weapon allows the military to take advantage of the counting rules in the 2010 New Strategic Arms Reduction Treaty (New START), which counts each strategic bomber as one launcher and one warhead, regardless of the number of cruise missiles and gravity bombs they can carry.

It is not surprising that military planners would want many different ways of attacking a target. But how much added deterrence value do air-launched cruise missiles actually provide in the minds of potential adversaries?

The weapons associated with the other two legs of the nuclear triad–namely, SLBMs and ICBMs–can penetrate air defenses and strike targets anywhere on the planet with high confidence. The United States possesses far more warheads for these missiles than does Russia and could upload hundreds of warheads to its deployed ballistic missiles and bombers. In addition, the Navy’s sea-launched Tomahawk cruise missile is also a highly capable and continually improving conventional standoff weapon, and it has an even longer range than the JASSM-ER.

Has the military identified possible technical or other problems that could compromise the sea and ground based legs of the triad? What specific targets cannot be effectively and credibly held at risk by other nuclear and standoff weapons, together with gravity bombs, that could only be held at risk by the current ALCM and later, the LRSO force? How large and unique is that target set?

The Defense Department believes SLBMs, ICBMs and gravity bombs have different characteristics than ALCMs and are not perfect substitutes. At least a portion of the total ALCM force can also be more quickly uploaded to the deployed force than non-deployed ballistic missile warheads. (Note: nuclear ALCMs are not deployed on B-52H bombers on a day-to-day basis. Roughly 200 of these missiles are believed to be deployed at Minot Air Force Base in North Dakota armed with the W80-1 nuclear warhead.)

Yet as Hans Kristensen with the Federation of the American Scientists notes, “the bottom line for an effective nuclear deterrent is the credible capability to hold at risk the targets that an adversary values most.” On the issue of timing, how essential for deterrence is the quicker generation time for ALCMs? It is also important not to forget that B61 bombs can be rapidly uploaded to the B-2 and later the B-21.

Finally, regarding the New START bomber counting rule, it has been reported that the United States originally preferred an agreement that would count the actual number of nuclear bombs and ALCMs at air bases for use by bombers, but compromised and agreed to a discount rule that attributes each deployed bomber as one warhead. If such an agreement had been reached would reductions in the ALCM force have been required? There have also been reports that the United States was prepared to go lower than the 1,550 accountable warhead cap in the treaty.

Russia’s Actions Do Not Require Pursuit of a Costly New ALCM

Some LRSO advocates suggest that because Russia is fielding nuclear and conventional cruise missiles on aircraft, submarines, and surface ships, the United States must retain a nuclear cruise missile option.

Such arguments ignore the fact that the United States did not acquire the ALCM because the Soviet Union had such a capability, and it does not maintain or need to replace the ALCM because Russia has nuclear cruise missiles. It is not in the U.S. interest to engage in a new tit-for-tat arms race with the Russians to rebuild an excessively large nuclear force. This is especially true if it comes at the expense of needed conventional improvements that are more relevant to countering Russia and maintaining America’s military technological edge.

Questions about ALCM's Role in Current U.S. Strategy

Proponents consider a new ALCM necessary to maintain an effective U.S. nuclear deterrent because the current missile is losing its ability to penetrate increasingly sophisticated air and missile defenses.

Multiple sources with knowledge of the existing ALCM have stated that the reliability of the missile is not assured over the next ten years and that there are serious restrictions on the current use of the ALCM due to reliability issues. This suggests that the current ALCM could play more of a "backup" role in U.S. nuclear planning. Consequently, it would be imprudent to spend $20 billion or more to build a new nuclear air-launched cruise missile that could increase the role these weapons play in U.S. policy.

The Imaginary Strategic Bomber Gap

Some advocates of the LRSO erroneously claim that without the new weapon, a strategic bomber "capability gap" will emerge in the late 2020s and last for at least a decade. They argue that because the B-21 bomber will not be available in sufficient numbers for the nuclear mission until the 2040s, the U.S. military will need to continue to use B-52Hs armed with LRSOs until then.

It is important to keep in mind that LRSO production is slated to begin in 2026 and reach only initial operating capability by 2030. It will be several years later before full operating capability is achieved.

In contrast, the B-21 is slated to achieve an initial operating capability in 2025, with nuclear certification to follow two years later. The initial capability could include as many as 24 planes.

Meanwhile, the Air Force has announced a full production rate of 7-8 B-21s per year. Assuming the United States continues to deploy no more than 60 nuclear capable strategic bombers (as it currently plans to do under the New START treaty), the B-52 may need to be removed from the nuclear mission as soon as the early to mid-2030s in order to accommodate the B-21.

In sum, the current bomber force will provide a more than formidable capability and would become even more potent when the B-21 is fielded with the B61 mod 12 and advanced conventional cruise missiles. Fears of a "bomber capability gap" are misplaced.

The New LRSO Would Create New Military Capabilities and Could Prompt Countermeasures

Proponents of the LRSO claim that it would simply sustain an existing capability, not expand that capability. They claim the new missile will not be used for new military missions and air-launched cruise missiles would not pose a destabilizing first-strike threat to potential U.S. nuclear adversaries.

In reality, the president’s nuclear modernization program is vastly increasing the military capability of U.S. nuclear weapons, including the bomber leg, across key attributes such as stealth, accuracy, range, and speed. The LRSO is likely to have greatly enhanced capabilities relative to its predecessor, and will be mated to the B-52H, B-2 and B-21 bombers, whereas the current ALCM can only be delivered by the B-52H. U.S. nuclear stealth bombers have never carried stealthy nuclear cruise missiles.

The LRSO raises serious questions about stability that have yet to be fully explored. Some sources have revealed that the Pentagon is envisioning potential uses for the new cruise missile that go beyond "the original mission space" of the ALCM, namely in limited nuclear war-fighting contingencies involving China. Some supporters of the LRSO emphasize its utility for achieving tactical surprise in combat.

Furthermore, as stressed by William Perry, President Bill Clinton’s defense secretary, and Weber, "cruise missiles are a uniquely destabilizing type of weapon" due to the fact that "they can be launched without warning and come in both nuclear and conventional variants." The possible risk of miscalculation and unintended escalation posed by the LRSO requires far more scrutiny than blithe assertions from administration officials that the missile won’t upset stability.

Bottom Line

While it is uncertain what the military budget will look like a decade from now, there will likely be insufficient funding for the complete portfolio of proposed nuclear and conventional modernization goals. This will force the U.S. government to choose between the nuclear effort and other military priorities.

As senior White House officials have noted, the current "modernization plan was put together in a different budget environment, with a different Congress and varied expectations about our future arms control efforts. Our administration has already made plain our concerns about how the modernization budget will force difficult trade-offs in the coming decades. And the President will continue to review these plans as he considers how to hand the baton off to his successor."

The estimated $20-$30 billion cost to buy the LRSO and W80-4 would be much better spent on other parts of U.S. nuclear and non-nuclear mission areas.

The choice is clear: chart a more realistic path for the nuclear arsenal that doesn’t severely constrain the force-sizing options of future presidents and reduces the risk of doing serious damage to conventional capabilities and other national security programs.

As an early step in this course correction, the Pentagon should cancel its new cruise missile program and prioritize continued investments in the other legs of the nuclear triad and more relevant and usable non-nuclear capabilities, including longer-range conventional cruise missiles and other advanced air defense suppression tools.

—KINGSTON REIF, director for disarmament and threat reduction policy

###

The Arms Control Association is an independent, membership-based organization dedicated to providing authoritative information and practical policy solutions to address the dangers posed by the world's most dangerous weapons. 

Resource Library:

Posted: June 12, 2016