Another stab ...
5. The Germans receive one module of 100+mm OBA (HE/Smoke) directed by an Offboard Observer(C1.63) at Level 3 in a south-edge hex recorded openly after American setup. The first chit draw is automatically black; permanently remove one black chit from the Draw Pile (C1.211). The module is limited to two Fire Missions, one HE and one Smoke, and each Fire Mission is automatically Cancelled at the end of the Player Turn that FFE:1 is resolved. Extra chit draws (C1.21) are NA for the first Fire Mission.
I agree that if it doesn't specify a "secret" location, then it defaults to public, but I also want to avoid misinterpretation. I'm saying "after American setup" because the way the scenario currently stands, the Germans set up first and move first. (The Germans set up three broken squads that represent the remnants of the security force, but the Americans still set up as if there were no German units on board.)
Perhaps the SSR is getting too complicated and I should revert to something more standard, maybe just say all Fire Missions are Cancelled at the the end of Turn 3. Something like that.