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.