Direct radio communication between troops in action and supporting
aircraft is less to be anticipated than ground-to-air visual
signaling. Supplies (of which enough for a few days only are
taken initially) will be demanded by means of flags, panels, and
perhaps flares. Bogus panels and flags would effectively confuse
pilots, as was successfully done in Crete. Air support will be
demanded by radio only indirectly, by way of rear headquarters
and the headquarters of the supporting air unit.