Me writes:

I know of those two; but picture MSFC 68-IND-1200-24 A
as seen on page 55 of Haynes shows "C band Radar" in the
IU, next to the air supply tank.


That is the transponder for the Range C band Radars

Ground-based tracking radar? That would make lots of sense to
me; I didn't understand why the heavy part wouldn't be on the
ground.

I assume there were 3+ sites so they could triangulate
the position.


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