Air-Sea Battle and Offshore Control are not Mutually-Exclusive: Part 2

Yesterday we summarized the main arguments surrounding Air-Sea Battle and Offshore Control. We also noted several variables that thus far have been largely overlooked in the debate: the belligerents’ characterization and valuation of their political objectives, and a confrontation’s unique political and strategic circumstances. Over the next two days, we will use plausible interactions between these variables to outline how relevant elements of Air-Sea Battle and Offshore Control can be integrated within a single strategic concept that covers the full spectrum of potential conventional Sino-American conflicts.

Scenario #1: High-End Salami Tactics

Let’s suppose that Chinese leaders sought to extract some political concession(s) by forcibly blockading one of a U.S. East Asian ally’s populated maritime territories or seizing one of its remote, unpopulated/sparsely-populated maritime territories. Let’s stipulate, though, that the initial Chinese actions did not result in direct hostilities with the U.S. ally’s military forces, and that any clashes were limited to exchanges between the belligerents’ constabulary forces such as coast guards or national law enforcement agencies.

The U.S. response in such a contingency would likely involve positioning and posturing its in-theater conventional forces in order to latently support allied constabularies’ or military forces’ efforts to counter or delegitimize the Chinese actions, not to mention deter Chinese escalation. Some lower-campaign value American forces might overtly line up alongside the ally’s frontline defenders to show solidarity and create a latent tripwire threat; this kind of response would be very desirable for accompanying vessels running through a Chinese blockade. Heavier U.S. forces latently backing this frontline from ‘over the horizon’ would likely take measures to conceal themselves from Chinese maritime surveillance and reconnaissance; their aim would be to severely limit Chinese opportunities for an effective preemptive first strike and thus enhance crisis stability as well as U.S. deterrence credibility. As U.S. political leaders would likely strive to avoid placing U.S. military units in situations where they would risk setting use-of-force precedents themselves, it seems unlikely the U.S. would impose any kind of distant blockade against China at this stage. Instead, information operations and diplomatic maneuvers to build regional and global opposition (or at least disengaged neutrality) to China’s actions would likely dominate the U.S. grand strategic response.

It is important to note, however, that the absence of direct military action in the physical domains almost certainly would not extend into the cyber and electromagnetic domains. It is quite likely that there would be extensive cyber and Electronic Warfare (EW) skirmishing as both sides jockeyed for situational awareness advantages, harassed each other’s forces, or attempted to manipulate third parties’ perceptions. Both would accordingly face the challenge of waging this cyber-electromagnetic warfare without precipitating accidental or inadvertent escalation.

Scenario #2: Limited War in the Contested Zone

Now, let’s examine a scenario in which initial Chinese actions did lead to direct hostilities between the PLA and the U.S. ally’s forces at sea or on the territory in question. Let’s also assume that the PLA did not escalate by striking civil, economic, or military infrastructure located within the ally’s homeland ‘core.’ Let’s additionally stipulate that in its ‘first move’ the PLA neither struck U.S. forward bases and forces in the region, nor deployed to interdict America’s maritime lines of communication with the ally. We could therefore conclude Chinese leaders valued their political objectives highly enough to resort to direct military force, but that the limited scope of those objectives encouraged them to adopt strategically-significant degrees of restraint—at least during the conflict’s opening phase.

The American military response under such conditions would likely lean closer towards Offshore Control’s concept of a limited war within the contested zone, as U.S. political objectives would center upon arresting the Chinese aggression and eventually restoring the status quo ante without escalating the conflict unnecessarily. This means the U.S. war effort would likely be structured to conform to China’s precedent-setting actions in the conflict. Of course, nothing would preclude U.S. political leaders from determining that their own objectives and the conflict’s circumstances necessitated the setting of selected precedents by U.S. forces as well.The bias against doing so would nonetheless be high.

U.S. war strategy would be based around the use of sequential (and sometimes parallel) Joint conventional combined arms campaigns that gradually attrited the PLA’s offensive capabilities within the bounds of the contested zone while dislodging Chinese forces from any territorial spoils. Unlike Offshore Control, though, the U.S. strategy would not strive for persistent denial of a sizable majority of the East and South China Seas to the PLA. Nor would the U.S. strategy strive for permanent absolute control of the oceanic approaches to East Asia. Sea control and denial of these magnitudes and durations are neither necessary nor practicable, as Julian Corbett observed a century ago in his masterwork Some Principles of Maritime Strategy.

Consistent with Corbett’s logic, U.S. forces would instead strive to deny the PLA’s ability to transit or occupy selected maritime areas for discrete periods. Short-duration denial efforts might entail concentrating U.S. air and naval power in time and space against PLA forces once the latter were detected at, over, or under the sea. Longer-duration denial efforts could take the form of leveraging pre-deployed land-based anti-ship/anti-air missile batteries as well as offshore minefields to protect friendly territories and chokepoints. Offensive minelaying in the approaches to Chinese naval bases would also be an option for longer-duration sea denial.

Similarly, U.S. forces would strive to control only those maritime areas that it and allied forces (as well as protected commerce) would need to traverse in order to achieve U.S. political objectives, and only for the periods of time necessary to do so. One could picture this type of control as a purpose-defined ‘moving bubble’ of superiority in time and space centered on the military force or commercial convoy in transit. Longer-duration (but not permanent) control over fixed areas would only be necessary in the maritime approaches to U.S. and allied territories, or otherwise in the areas surrounding PLA-occupied allied territories if U.S. and allied forces were engaged in forcible entry operations.

The U.S. and its embattled ally could also conceivably allow the PLA to seize and occupy one or more contested territories of relatively low military-strategic value, as that might induce China to excessively allocate scarce materiel and vulnerable forces in order to hold onto its spoils. Chinese assets exposed in this way could be subjected to withering and incessant attacks that would help gradually reduce the PLA’s quantitative advantages in theater. This might have the secondary effect of drawing Chinese attention and resources away from more important U.S. or allied operations elsewhere in the theater.

It is additionally possible U.S. political leaders might order some form of cumulative campaign to provide indirect support to the conventional campaigns and perhaps pressure the Chinese economy at the margins. This might include a distant blockade (as feasible given available forces and supporting infrastructure), plausibly-deniable special or irregular operations against Chinese economic interests in other countries, severing countries or foreign companies that attempt to engage in proscribed trade with China from access to the U.S. financial system, or other measures. U.S. political leaders would obviously have to weigh how these kinds of coercive actions might detrimentally provoke China as well as third parties to the conflict.

Above all, it must be appreciated that the U.S. would be not able to successfully defend a frontline ally in a limited conflict—never mind restore the status quo ante—in the absence of several key factors associated with Air-Sea Battle. For example, doctrine and capabilities that enhance U.S. forces’ resiliency against a conventional first strike are critical to intra-conflict deterrence credibility. The same is true with respect to capabilities that promote latent and highly survivable U.S. conventional escalation dominance such as submarines, long-range strike aircraft, and an intelligently-crafted balance between long-range and short-range guided munitions. Most importantly, U.S. air, ground, and naval surface operations within a contested zone would not be practicable and U.S. and allied intra-theater lines of communication would not be defensible without extensive operations against PLA maritime surveillance/reconnaissance networks. While some Air-Sea Battle critics have asserted such operations would carry the escalatory risk of attacking PLA nuclear forces’ C³ architectures, the former’s maritime sensors and their supporting data pathways outside China’s borders are most definitely not part of the latter. Even so, and depending on the operational and tactical circumstances, deception and concealment in the face of those sensors might be far more effective and impactful than destroying them.

If Chinese restraint held following a U.S. intervention along the lines I’ve suggested, both sides would be able to take advantage of deep operational-strategic sanctuaries for basing and maneuver within the combat theater. The practical result of this might be a protracted conflict that could remain limited unless one of the belligerents’ political objectives and perceptions of the conflict’s circumstances eventually came to demand escalation. Conversely, conflict protraction along these lines and unambiguously strong U.S. and allied resolve might drive Chinese leaders to seek out a mutually-tolerable negotiated settlement if their political objectives encouraged as much. In the second-best outcome, U.S. and allied forces would be able to induce China to break off its aggression and (if applicable) restore the territorial status quo ante in exchange for nothing more than relatively symbolic gestures. The ideal outcome would obviously be convincing Chinese leaders that a limited war within the contested zone would not be quick, cheap, or low-risk, thereby deterring them altogether from seeking one.

Tomorrow, addressing scenarios for major war.