Compass Points - Better CAS?

Marine Corps Compass Points

The F-35 Lightning II fighter, costing roughly $100 million per aircraft, faces growing skepticism regarding its practical availability for low-altitude close air support (CAS) missions. While the U.S. Marine Corps historically pioneered CAS to protect ground forces, the high cost and scarcity of stealth fighters make their deployment in low-and-slow battlefield environments highly unlikely.

This operational tension traces back to World War II and the Korean War, where foundational CAS tactics were forged in environments like Guadalcanal and the Pusan Perimeter. To address this capability gap, the bipartisan BRRRRT Act in Congress proposes maintaining at least 126 Air Force A-10 Thunderbolt II aircraft through fiscal 2033. Transferring these rugged, heavily armored platforms to the Marine Corps offers a survivable, dedicated alternative. The A-10 is built for this. It can withstand 23mm high-explosive projectiles and operate under low weather ceilings. Ultimately, integrating these retired Air Force assets could preserve organic Marine CAS capabilities without exhausting expensive multirole stealth fleets.

Comment

The debate over retiring the A-10 Thunderbolt II reveals a fundamental doctrinal friction between high-altitude multirole platforms and dedicated close air support. While the F-35 Lightning II emphasises survivability in contested airspace, its high operating costs and sensor-dependent targeting conflict with the visual, low-altitude coordination required for immediate ground support. Marine Corps doctrine, codified in MCWP 3-23.1, historically relies on tight integration between aviation and infantry. This integration is difficult to replicate with F-35 stealth assets designed for deep-strike missions rather than prolonged battlefield loitering.

The physical design of the A-10 Thunderbolt II directly enables this close-knit doctrinal relationship. Its titanium-armoured cockpit bathtub and redundant manual flight-control systems allow pilots to operate within the engagement envelopes of short-range air defences. This mechanical resilience ensures that the GAU-8 Avenger cannon can be brought to bear at ranges where digital target handoffs from high-altitude platforms are too slow or easily degraded by electronic warfare.

Strategic Question for Discussion

If the GAU-8 Avenger cannon remains the benchmark for immediate, low-altitude suppression, does the transition to sensor-fused munitions on the F-35 Lightning II fundamentally break the established Marine Corps close air support loop, or merely digitise it?

The pattern of recent conflicts suggests that sensor-fused targeting on the F-35 Lightning II cannot fully replace the rapid, visual target identification provided by low-altitude platforms. While digital handoffs streamline long-range strikes, they remain vulnerable to electronic jamming and lack the immediate psychological deterrence of the GAU-8 Avenger cannon. Consequently, transitioning entirely to high-altitude platforms likely degrades the responsive, visual coordination that has defined Marine infantry support since the Pusan Perimeter.

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