Which of the following is not a US Cold War air-to-air missile?

The AIM-10 Raptor is not a US Cold War air-to-air missile. While the other options represent actual air-to-air missiles developed and deployed during the Cold War period, the AIM-10 Raptor does not exist in military history.

The AIM-4 Falcon, AIM-7 Sparrow, and AIM-9 Sidewinder were all operational missiles used during the Cold War, contributing to air-to-air combat capabilities. The AIM-4 Falcon was introduced in the 1950s and was one of the early air-to-air missiles. The AIM-7 Sparrow is a semi-active radar-guided missile, which became a key weapon for many US aircraft in the Vietnam War. The AIM-9 Sidewinder is a widely recognized infrared-guided missile that has seen extensive use since its debut in the 1950s and continues to be an important part of air combat arsenals even today.

In contrast, the AIM-10 Raptor is not only a fictional designation but also misleading as it suggests a missile that might resemble the real-world advanced warplane, the F-22 Raptor, which was developed later, well after the Cold War period.