The Navy sent the retired USS America aircraft carrier to its final resting place at the bottom of the sea Saturday, in a closely guarded series of explosions that the Navy didn't announce until days later. The 84,000-ton, 1,048-foot warship, which served the Navy for 32 years, thus became the first U.S. carrier to be sunk since 1951, and the largest warship ever sunk. "Explosions were internal to the ship and allowed a controlled flooding," said Pat Dolan, a spokeswoman with the Naval Sea Systems Command. She declined to say where the ship now sits, except that it was 50...