The pallets on the left look like they're 36X48 paper pallets. The other two look like they have a squarer aspect ratio either square or possibly 40X48.
So it would seem to me that some might be mil spec but the others are non military.
He'll head south before turning towards Sicily & Sigonella. It's probably an RQ-4 he'll also drop off ADSB as he approaches Italian airspace.