Nathan Hale/In-universe

Captain Nathan Hale (June 6, 1755 – September 22, 1776) was a soldier for the Continental Army during the American Revolutionary War. He volunteered for an intelligence-gathering mission in New York City but was captured by the British and executed. His last words before being hanged were purported to be "I only regret that I have but one life to lose for my country. He was considered to be the first Agent X.