 Complete the following phrase:  Thiele was posted to an operational training unit before being transferred to the Canadian No. 405 Squadron at RAF Pocklington a few miles east of York, equipped with Wellington IIs. Thieles first mission was almost his last. Returning from Cherbourg in France in January 1942, Thiele got the green light to land, but as he touched down was confronted by another aircraft. The two planes collided engine to engine, ripping the wings off. The court of inquiry absolved him. On 3031 May 1941, flying a Halifax, Thiele took part in the 