The AN/ALR-56 is a software-controlled radar warning receiver. Its C model is on all F-15 series fighter aircraft except the Japanese F-15J and Israeli F-15I version of the F-15E Strike Eagle. The M model is used on F-16 Fighting Falcon and C-130 Hercules aircraft. An AN/ALQ-213 can act as its electronics countermeasures suite controller.
It has receivers for a high and low radar frequency band, and has an architecture that can be upgraded for more threat signal types. The C model also manages a AN/ALE-45 expendables dispenser and AN/ALQ-135 jammer.
Israel uses a domestically manufactured equivalent. Japan's is the J/APR-4 jammer.