The S103 also shows up in "Tractics III: Modern and Special Weapons" by Gary Gygax and Dave Megarry (old old tabletop wargame that came out around the same time the original three-pamphlet D&D set did - stuff like the Sheridan, S-Tank, TOW missiles etc. were under the "future weapons" section (tho the TOW had been around since the mid-early 60's! Also, amusingly, the rules list that the Sheridan can fire a nuclear artillery shell!)
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