Comment by jefftk
13 hours ago
> Though I suppose another possibility is that they all share an identical pylon design or something like that.
They're very closely related planes (MD-11 is an upgraded DC-10; KC-10A is a military version of the DC-10), so that wouldn't be surprising. Likely the KC-10A has the same pylon, and the MD-11 has one that's similar enough that it's worth being cautious.
No military operates the KC-10 anymore. There are a grand total of two remaining in use as aerial firefighters.