The aircraft belong to 8th Special Operations Squadron, US Air Force unit that is part of Special Operations Command.
To quote the factsheet:
“The primary mission of the 8th SOS is insertion, extraction, and re-supply of unconventional warfare forces and equipment into hostile or enemy-controlled territory using airland or airdrop procedures. Numerous secondary missions include psychological operations, aerial reconnaissance and helicopter air refuelling. To accomplish these varied missions, the 8th SOS utilizes the CV-22 Osprey, a highly specialized Bell-Boeing tilt-rotor aircraft.”
And it is not the first time they have been here, they transited through YYT last october.