Buzz Babcock

 was the commander of the U.S. forces in Canada at the time Canada was annexed by the United States. He is mentioned in one of the articles found on a terminal at the Capitol Post building.

Quotes
"That was the last straw. You know what's been stopping the Reds from pouring into downtown Juneau? American soldiers, that's what. And now we've got to worry about someone - Chinese, Alaskan, or otherwise - taking out the pipeline? I don't think so. Effectively immediately, United States troops are beginning a complete takeover of all Canadian assets and resources. Little America is ours. But let's face it - it always has been."

Appearances
 is mentioned in Fallout 3 but does not actually appear in the game.