Britain's $3.7B aircraft carriers were meant to take a crowning role in a major NATO exercise — then failed to set sail, twice

• UK aircraft carriers failed twice in a row to play their part in NATO exercises.
• First HMS Queen Elizabeth broke down, then its replacement also didn't launch as scheduled.
• It has put the spotlight on the capabilities of the UK Royal Navy, which aspires to be world-leading.

A UK Royal Navy aircraft carrier canceled its launch to join a NATO exercise on Sunday, the second similar failure in a week.

A UK carrier was meant to be a centerpiece of NATO's Steadfast Defender exercises taking place off the coast of Norway.