My opinion is basically that recce results should be available before a commander even thinks about moving towards some grid coordinates.
The only assets that can flood a theatre with observation & reporting capability at reasonable costs and effort and provide that kind of coverage are either aerial (SAR/GMTI radar, Sigint), orbital (electro-optical, IIR, SAR/GMTI, Sigint) or LRS.
Aerial and orbital sensors have limitations that cannot be overcome without scouts on the ground, therefore I believe that an appropriate share for LRS would be a strong battalion per corps (unless the terrain is too open or the warfare too static or force densities in the theatre too high).
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