Frank Christopher was a human living on Earth in the 21st century. Christopher was a pilot who held the rank of Lieutenant in the United States Army Air Force. He flew a helicopter over the nuclear missile silo used by Zephram Cochrane's team in Montana after reports of an extraterrestrial vessel landing there. He got a good look at the Vulcan ship, later telling The New New York Times that it looked like a cathedral. He and the helicopter almost crashed when the alien ship departed the area. (ST reference: Federation: The First 150 Years)