I was an F-15 weapons crew chief from 1980-1984 with the 555 tfts and worked on F-15s' the entire time there. 99 percent of the time we loaded a center line 600 gallon tank, an AIM-9J,P or L on the outer left or right SRM launcher. An ACMI pod on the other out side SRM launcher and an AIM-7 simulator on one or more of the MRM launchers. And up to 940 rounds of 20mm. The AIM-7 simulator was not a missile. It was a small black disk that fit in the launcher umbilical where the missile was electrically attached to the airplane. This fooled the armament sytem to think that it was carrying an AIM-7