The US army enlisted its first female colonel, Julia Flikke.
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Luciano Pavarotti's final opera took place at New York Metropolitan Opera.
Sixteen primary school children and one teacher were killed in a mass shooting in Dunblane, Scotland.
Marvel's 'Captain America: The Winter Soldier' premiered in Los Angeles.
Earmuffs were patented.
Prolific killer John Wayne Gacy was given the death sentence for the murder of 33 young men and boys.
