Their learning process was therefore fitful and slow .
The 21st and 22nd Troop Carrier Squadrons were still based in Queensland and not at Port Moresby , so the aircrew were there on short rotations .
Troop Carrier Squadrons ' learning process was therefore fitful and slow .
The 21st and 22nd Troop Carrier Squadrons were still based in Queensland and not at Port Moresby , so the aircrew were there on short rotations .