--- title: "UFOs just the latest in a 70-year-long list of kills for the AIM-9 Sidewinder missile" description: "The Air Force’s AIM-9X Sidewinder missile has racked up UFO kills this month, adding to its 70 year record of dominance." date: "2023-02-14" modified: "2023-02-14" authors: - name: "David Roza" job_title: "YouTube Writer/Editor" link: "https://taskandpurpose.com/authors/david-roza/" url: "https://taskandpurpose.com/news/air-force-aim-9x-sidewinder-missile-ufo-history/" categories: - "Air Force" - "Around the World" - "Military Branches" - "Missiles" - "News" - "Tech & Tactics" - "United States" - "Weapons" tags: - "death" --- # UFOs just the latest in a 70-year-long list of kills for the AIM-9 Sidewinder missile ![aim-9 sidewinder]() *U.S. Air Force Staff Sgt. Leon Jones, 354th Aircraft Maintenance Unit weapons load crew chief, inspects an AIM-9 Sidewinder missile that was loaded onto an A-10C Thunderbolt II during a load crew of the quarter competition at Davis-Monthan Air Force Base, Ariz., Oct. 7, 2016. (Airman Nathan H. Barbour/U.S. Air Force)* The Air Force has been chalking up kills the past two weeks as its fighter jets shot down a Chinese spy balloon followed by a series of [unidentified flying objects]() over the United States. But no matter whether the F-22 or the F-16 fired it, the missile taking down all these mysterious visitors has been the same: the AIM-9X Sidewinder. The AIM-9 is a family of heat-seeking, air-to-air missiles that have an estimated 270 aircraft kills to their name, [according]() to a 2004 Air Force press release. Though there are several variants of the missile, it generally weighs about 190 pounds, is approximately 9 feet long, and has a diameter of about 5 inches, according to the weapon's [fact sheet.]() The AIM-9X is the latest iteration of the AIM-9 and can be fired from most U.S. military fighter jets, including the [F-15](), the [F/A-18](), [F-35]() and, as proven by recent events, the [F-22]() and [F-16](). ![aim-9x sidewinder]() *An AIM-9X Sidewinder missile shoots off the rail of an F-16 flown by Capt. Spencer "Memphis" Bell, over the test range at Holloman Air Force Base, New Mexico, Apr. 24, 2019 (Tech. Sgt. John Raven/U.S. Air Force)* The Sidewinder dates all the way back to the first successful test firing of the AIM-9A prototype in September 1953. In the years leading up to that, many U.S. military planners were focused on developing radar-guided missiles that could hit large Soviet bombers from as far away as possible. But a team of engineers led by Dr. William McLean at Naval Ordnance Test Station China Lake, California tried their hands at developing a more nimble weapon that could help fighters strike a wider range of targets and close the performance gap between the Navy’s primary fighter, the[ F9F Panther](), and its Eastern Bloc opponent, the MiG-15. The AIM-9 was relatively cheap to develop, partly because it was built with many “off-the-shelf” parts that already existed, explained military historian James Young in a[ 2021 history]() of the Sidewinder. “Taken together, these factors meant the Navy’s ideal missile might be a cheap, easy-to-use weapon that both markedly increased fighter capability and required minimal technology for employment in conventional conflicts,” Young wrote. ## Earning stripes While the AIM-9’s 60% kill rate in testing and early operations such as the [1958 Taiwan Strait Crisis]() showed great promise, the Vietnam War exposed the missile’s shortcomings. North Vietnamese fighter pilots figured out how to outmaneuver the missile, Young wrote, and American aircrews were undertrained on both the Sidewinder’s capabilities and on dogfighting enemy aircraft like MiG-17s. The 60% kill rate promised before the war fell to about 10 to 15% by the end of 1968. [**Subscribe to Task & Purpose Today**]()**. Get the latest military news, entertainment, and gear in your inbox daily.** The Air Force and Navy both worked to improve the missile’s performance through various technical upgrades, but the Navy showed the greatest gains in performance by improving the training of its aircrew through efforts like the U.S. Navy Fighter Weapons School (better known as [Top Gun]()). By the end of 1972, “the Navy’s Phantom II-Sidewinder combination became so deadly that NVAF MiGs began circumventing combat,” Young wrote. So began a long win streak for the Sidewinder, which continued to improve through technical upgrades such as the release of the AIM-9L and AIM-9M. Sidewinders fired from U.S. Navy F-14s destroyed two Libyan Su-22s in 1981, helped the Israeli Air Force [dominate]() Syrian MiG-21s and MiG-23s over Lebanon in 1982, and arguably [saved]() the United Kingdom’s air war against Argentinian Mirage IIIs and other aircraft during the 1982 Falklands War. The Sidewinder continued to prove its worth during the Gulf War, where it[ shot down]() Iraqi [MiG-21s](), [MiG-23s](), and even a [Mi-8 helicopter](). ![aim-9 sidewinder]() *A U.S. Air Force weapons load crew team from the 44th Aircraft Maintenance Unit carry an AIM-9L/M Sidewinder missile to an F-15 Eagle fighter aircraft during a quarterly weapons load competition April 3, 2017, at Kadena Air Base, Japan (Naoto Anazawa/U.S. Air Force)* But why is the U.S. military still using the missile now, almost 70 years after its first successful test? Part of the answer is that it still works, especially after all the technical upgrades that make the current AIM-9X a much more capable beast than its ancestors. Indeed, when Boeing won a contract in 2010 to support Sidewinder operations through to 2055, Air Force spokesperson Stephanie Powell said in a[ press release]() that the missile’s relatively low cost, versatility, and reliability made it “very possible that the Sidewinder will remain in Air Force inventories through the late 21st century.” ## Balloon popper McLean and his team of China Lake engineers may not have suspected back in the 1950s that the weapon they designed to take down nimble enemy aircraft would be used to destroy relatively static balloons or UFOs at the edge of space. In fact, when an Air Force F-22 pilot used an AIM-9X to destroy a Chinese spy balloon at about 60,000 feet above the Earth last week, it may have been the first time a Sidewinder ever reached such distant heights. “I don't know that they've tested an AIM-9 at that altitude,” the commander of the North American Aerospace Defense Command, Gen. Glen VanHerck,[ told]() reporters on Feb. 6. Another option to destroy the balloon was the AIM-120, a radar-guided missile, but the decision to use the AIM-9 instead “goes back to safety considerations and effectiveness,” VanHerck said. “You know, the AIM-120 has a significantly-larger range, a significantly-larger missile warhead.” ![aim-9x sidewinder]() *An F-15E Strike Eagle weapons load crew team lifts an AIM-9X Sidewinder missile to attach to a pylon July 15, 2019, at Al Dhafra Air Base, United Arab Emirates. The AIM-9X is an advanced infrared missile and the newest of the Sidewinder family of short-range air-to-air missiles carried on a wide range of fighter jets. (Staff Sgt. Chris Thornbury/U.S. Air Force)* The AIM-9X was considered to be a more safe but equally effective option compared to the AIM-120, VanHerck explained. Still, the AIM-9X can cost about a third to half a million dollars a pop, according to Department of Defense [budget documents](). Are there less expensive options for bringing down these balloons and UFOs, such as the cannons aboard Air Force fighter jets? Probably not without considerable safety risks. For example, the balloon was so high up that even the F-22, with its maximum ceiling of around 65,000 feet, was reaching the edge of its capabilities, as our colleagues at The War Zone[ reported](). That high up, closing to gun range with the balloon would have added unnecessary risk to the mission. The shells fired from such a gun run would likely cause only small holes in the balloon before flying for miles below, where “their kinetic energy alone” would be dangerous to anybody on the ground, The War Zone wrote. If the current pace keeps up, the AIM-9X will have quite a few more kills to its name, though it is still unclear what exact kinds of aircraft were killed. Either way, the Sidewinder has proved once again that it is not going by the wayside anytime soon. ## The latest on Task & Purpose - **Here’s why the Marine Corps** [**strapped a rare electronic warfare LAV**]() **to the deck of a warship** - [**Shot fired**]() **after intruder breaks onto Andrews Air Force base** - **That time a US Navy submarine got a** [**confirmed kill on a train**]() **during WWII** - **Coast Guardsman saves man** [**hours before graduating**]() **from rescue swimmer school** - **JTAC vs TACP: A user’s guide to the troops who call in** [**close air support**]() **Want to write for Task & Purpose?**[ **Click here**]()**.** ## Author David Roza writes scripts about military news for the Task & Purpose YouTube channel, and he also writes articles about military pay, benefits, health care, child care, culture, and other personnel topics on a freelance basis. Roza previously covered the Air Force and Space Force for Task & Purpose from 2019 to 2023 and for Air & Space Forces Magazine from 2023 to 2025. In the course of that reporting, he has set off a ‘Hollywood explosion’ with Air Force bomb techs, turned the (unarmed) keys of a nuclear missile bunker, hovered over the Nevada desert on an Air Force rescue helicopter, and got the best sleep of his life on the floor of a C-17 over the central Pacific. Share tips and story ideas with David at [david.roza@teamrecurrent.io]()