The US Air Force said on Thursday the commander of a nuclear wing had been sacked after his unit failed a safety inspection, trucks carrying missile parts crashed and officers under him fell asleep with launch codes in hand. Colonel Christopher Ayres, commander of the 91st Missile Wing at Minot Air Force Base in North Dakota, was removed Wednesday "due to loss of confidence in his ability to command," Air Force Space Command said in a statement. The Air Force has tried to improve its handling of the country's nuclear arsenal after a series of mishaps and blunders led to...