I have seen a lot of F-15 weapons load outs but have not seen in any of those configurations an aircraft carrying only the centreline fuel tank and carrying weapons under the wings.
Tamiya's 1/32 Strike Eagle has one configuration I recall that has a centreline tank and weapons on all stations.
My questions are
Did the Strike Eagle ever carry the centreline fuel tank only?
Was it discontinued after a certain time or operation and the configuration of load out and weight of weapons and range mandated carrying two under wing tanks instead of one centreline?