Widmore and Hawking were Natives. Widmore was wearing a US Army uniform just like the other 2 guys with him to infiltrate and exterminate any surviving Army soldiers. We also know that Widmore and "Ellie" were co-commanders in 1977 which to me means they're married, but in present day they seem seperated. Widmore knew where she lived, but he wanted to return to the Island and she knew how so clearly she refused to let him back.