The US Air Force’s shift from the F-111 Aardvark—a dedicated electronic warfare—to the more versatile F-15E Strike Eagle illustrated the changing priorities of the post-Cold War era.

The F-111 Aardvark was an innovative deep-strike platform designed during the Cold War. By the 1990s, however, the F-111 was aging and maintenance-heavy; despite being so innovative, it served only a narrow role at a time when multirole flexibility was becoming standard. To replace the F-111, and to field a platform capable of more than just deep strike, the Air Force modified its F-15 fighter into a multirole deep-strike platform, the F-15E Strike Eagle, which has served for 40 years as a flexible, multirole staple of US forces.

Why the Air Force Swapped the F-111 for the F-15E

The F-111’s original missions were deep strike, nuclear delivery, and low-level penetration. To accomplish such a demanding mission profile, the F-111 was packed with then-cutting-edge technology like variable-sweep wings and terrain-following radar (TFR), allowing the high-speed, low-altitude flight that deep-strike required. The platform’s strengths included long range, heavy payload, and all-weather capability—all geared toward penetrating Soviet airspace at low altitude.

But the F-111 was introduced in the 1960s, and a generation later, the complex swing-wing system had become a maintenance burden. Simultaneously, the threat environment had become more complicated, with improved air defenses and the rise of precision-guided munitions. The Air Force began searching for something more flexible, with better survivability.

The F-15E was based on the F-15 air superiority fighter, which was famously built “without a pound for ground.” The concept was relatively simple: add ground strike capability to the F-15 while keeping the renowned fighter performance intact. Key additions to the E-variant included conformal fuel tanks (CFTs), advanced avionics, and LANTIRN targeting and navigation pods. The crew was expanded to include a pilot and WSO to manage the complex strike missions. The result was a platform that fused fighter and bomber roles in one.

The outgoing F-111 had performed low-level ingress using terrain masking. The F-15E took a different approach, executing medium/high-altitude strikes with precision targeting. In all, the F-15E was a more dynamic platform, with air-to-ground, air-to-air, and dynamic targeting; the shift from F-111 to F-15E was very much a shift from brute-force penetration to precision strike warfare.

The F-111 vs. the F-15E: A Head-to-Head Comparison

Aircraft	F-111 Aardvark	F-15E Strike Eagle
Year Introduced	1967	1989
Number Built	563	340+
Length	73.5 ft (22.4 m)	63.8 ft (19.4 m)
Wingspan	63 ft (19.2 m) extended32 ft (9.8 m) swept	42.8 ft (13.0 m)
Weight (MTOW)	~100,000 lb (45,360 kg)	~81,000 lb (36,740 kg)
Engines	Two Pratt & Whitney TF30-P-100 turbofans (~41,000 lbf total thrust)	Two Pratt & Whitney F100-PW-229 or GE F110-GE-129 (~58,000 lbf total thrust)
Top Speed	~1,650 mph (2,655 km/h) / Mach 2.2	~1,875 mph (3,018 km/h) / Mach 2.5
Range	~680 nmi (780 mi, 1,260 km) low level	~790 nmi (910 mi, 1,460 km) with external fuel tanks
Service Ceiling	60,000 ft (18,300 m)	50,000+ ft (15,240 m)
Loadout	~31,500 lb (14,300 kg) payload; nuclear weapons, unguided/laser-guided bombs, AGM-69 SRAM, Paveway LGBs	~23,000 lb (10,430 kg) payload; JDAM, LGBs, AGM-65, AGM-130, AGM-158 JASSM, AIM-9, AIM-120
Aircrew	2 (pilot + WSO)	2 (pilot + WSO)

Was the F-15E an Improvement on the F-111?

The F-15E gave the Air Force greater flexibility and reduced the need for escort fighters—all while improving survivability on deep-strike missions. Basically, the F-15E was a bomber that could do its own air-to-air fighting. This capability improved overall expeditionary warfare capability, which fit the nature of post-Cold War conflicts. And through role consolidation, the Air Force was able to reduce the number of specialized aircraft in the inventory, thereby saving on costs, maintenance, procurement, logistics—everything.

The F-15E is hardly the only post-Cold War example of role consolidation. The Navy’s F/A-18 is another great example, fusing the strike role of the A-6 with the fleet defense role of the F-14. Today, role consolidation is fairly standard; aircraft like the F-111, which were built very specifically to fight one war, are no longer viewed as a worthwhile investment. Instead, aircraft like the F-15E, which can be slotted into a variety of different conflicts (including Operation Epic Fury), are the new standard.

About the Author: Harrison Kass

Harrison Kass is a writer and attorney focused on national security, technology, and political culture. He holds a JD from the University of Oregon and an MA in Global & Joint Program Studies from NYU. His work has appeared in City Journal, The Hill, Quillette, The Spectator, and The Cipher Brief. More at harrisonkass.com.

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