And finally, RHAF AU has 16 DHC-6 Twin Otter, which were ordered together with the float plane variant from private seaplane airliners. In total, about 80 Twin Otter are in service in HLK, only RHAF ones have convectional wheels plus those operated by HCPR, last equipped with tundra tires. Drawing resembles a 300-series Twin Otter, not sure if there are any external differences between 300-series and 400-series.
So, in my RHAF AU, the Air Transport Command has 5 squadrons:
Tactical Transport Squadrons: 354th (C-295M), 357th (C-295W), 355th Squadron (DHC-5), 356th (C-130J/J-30 Hercules) -numbers borrowed from real life Hellenic Air Force.
Heavy Transport Squadron: 373 th (CC.154 Bison) -AU Squadron
Special Operations Squadron: 358th (DHC-6)