In 1989 a two-year study began regarding possible mid-life upgrades for the USAF's and European Partner Air Forces' (EPAF's) F-16A/Bs. The resulting F-16 Mid-Life Update (MLU) package was designed to upgrade the cockpit and avionics to the equivalent of that on the F-16C/D Block 50/52; add the ability to employ radar-guided air-to-air missiles; and to generally enhance the operational performance and improve the reliability, supportability and maintainability of the aircraft. Aircraft receiving this set of updates are designated F-16AM or F-16BM. 你维基咋查的....