In the readme it says the following for binocs:

-Binoculars
In some situations, the Binoculars can be used to call
in an Air Strike in the event you run out of Panzerschreck
shells. Simply bring up the Binoculars and put the target
in your sights, then hit the Primary Attack button. Within
a short amount of time, an Allied plane will destroy the
target.

It only works at the half-track.

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5th SS Panzer Division Wiking