[Recceswind]

Thanks! It looks a little bit complicated. So generally, units consisting of 2-6 airplanes are called "patrouille" - additional word is added (e.g. patrouille légère) only when we know number of the planes?

And one additional question: what was the name of the air defense observation points/stations (I mean such points/stations, which were helping own fighters to intercept advancing bombers; they were giving information about heading and altitude)?

Subunit - as far as I know, all military units larger than battalion are called "units". Everything smaller is a "sub-unit".