F-15EX May Finally Get Missile Warning System The USAF Originally Skimped On Buying
The U.S. Air Force is looking at adding a missile warning system (MWS) to its new F-15EX Eagle II fighters. This will give the aircraft a way to optically detect incoming missile threats, especially passively guided ones like heat-seeking infrared-guided missiles, which they currently lack. The continued absence of an MWS has become more pronounced in light of recent combat experiences over Iran.
The F-15EX is derived from earlier F-15 variants that all have MWSs, and it had seemed logical to expect the Eagle II would feature this capability. So it was puzzling when the first examples rolled out without such a system, and no apparent plans to install one on a jet already costing upwards of $100 million. The omission has been glaring for years now, especially given that the aircraft has all the provisions for such a system, including blanked-over spots for the sensors.
The 22nd F-15EX for the US Air Force seen departing Boeing’s plant in St. Louis, Missouri, in August 2026. USAF/Senior Airman Melany Bermudez
The Air Force has 22 Eagle IIs in inventory now and currently plans to acquire a total fleet of 267 of the jets. The aircraft’s manufacturer, Boeing, is on contract now to build 120 F-15EXs, including a lot of 22 jets through a new $2.38 billion deal also announced yesterday.
Now, the Air Force Life Cycle Management Center’s (AFLCMC) Fighters & Advanced Aircraft Directorate “is seeking sources for the procurement of an operationally qualified threat missile launch and approach warning system for rapid integration into the United States Air Force (USAF) F-15EX Eagle II fighter aircraft,” per a contracting notice put out yesterday. “The MWS must alert the F-15EX aircrew to the presence of missiles that may threaten the aircraft without unreasonably distracting the aircrew with false alarms.”
As mentioned, the F-15EX is already configured to accommodate an MWS, inside and out, something AFLCMC’s notice emphasizes. This is a result of the Eagle II having been directly derived from the F-15QA variant for Qatar, which itself was an outgrowth of the F-15SA for Saudi Arabia. While many of the F-15EX’s advances come from these aircraft, the first F-15 variant to get an MWS was actually Singapore’s F-15SG. The Advanced Eagle line and the F-15SG are part of Boeing’s extended F-15E Strike Eagle family.
A pair of Qatari F-15QA Advanced Eagles. USAF
“The MWS must use the six (6) pre-existing F-15EX sensor locations, data cables, power cables, and cooling,” the contracting notice says. “It must be easily, safely, rapidly, and organically installable and removable in the field by USAF military aircraft maintenance personnel without requiring any change to aircraft configuration beyond installation of MWS line replaceable units (LRUs) in the six (6) pre-existing locations in the aircraft dedicated for missile warning.”
Those most visually prominent of those pre-existing sensor locations are two horn-like sponsons, one on each side of the forward fuselage right below the cockpit canopy. There are two more locations at the ends of the jet’s tail booms. The last two locations are situated so additional sensors can face straight up and down to provide total 360-degree coverage.
A closer look at the nose end of an F-15EX, with the right-side horn-like sponson under the cockpit plainly visible. USAF/Master Sgt. Steph Sawyer The F-15EX also has pre-existing locations for MWS sensors at the ends of its tailplanes, as can be seen in this picture. USAF
The sources sought notice does not mention any specific MWS and invites prospective vendors to submit proposals. It also stresses that the Air Force is still in the “market research” phase of the contracting process and that it “does not constitute [a] solicitation and shall not be construed as a commitment” to buy such a system.
The F-15SA uses the AN/AAR-57 Common Missile Warning System (CMWS), and this system is understood to also be found on the F-15QA. Beyond F-15 variants, versions of the AN/AAR-57, for which BAE Systems is currently the prime contractor, are fielded today on a wide variety of other fixed-wing aircraft and helicopters, including various types in U.S. military service. CMWS variants are notably found across the U.S. Army’s AH-64, UH-60, and CH-47 helicopter fleets.
A picture of a Saudi Arabian F-15SA Advanced Eagle. Jamie Hunter Another close-up look at a Saudi F-15SA, offering a particularly good view of one of the aircraft’s missile warning sensors. USAF/Staff Sgt. Isaiah Soliz
All versions of the CMWS consist of several electro-optic missile sensors (EOMS), the number of which varies from platform to platform, linked to a central electronic control unit (ECU). The system is also designed to be integrated into larger defensive suites.
A picture showing five of the electro-optic missile sensors (EOMS) used in the AN/AAR-57, as well as the electronic control unit. BAE Systems
While the AN/AAR-57 is a proven system with years of successful integration on the F-15 and other platforms, it is just one option of the open market today. The Air Force could choose to take another route, possibly with a new system that offers added functionality.
The addition of any MWS will give the F-15EX a valuable, if not increasingly critical, boost in defensive capability. The Eagle II does already have an extremely powerful self-protection suite, including the Eagle Passive/Active Warning Survivability System (EPAWSS). However, it is heavily geared toward defending against radar-based threats that pump out signals that can be detected and jammed. Infrared-homing anti-air missiles zero in on their targets passively.
In general, MWSs also typically make use of passive infrared sensors to spot the heat plumes of missile launches and the thermal signatures of those threats as they continue their approach. BAE
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