In this monograph, Dr. Armstrong argues that a nation founded in Enlightenment theory can rely on Kant's categorical imperative as a rationale for voluntary service in one's local National Guard. Since the 19th century, a Utilitarian argument has been the favored rationale, but in We Hold These Truths to be Self-Evident: The National Guard of the United States and Immanuel Kant's Categorical Imperative Dr. Armstrong contends that there is also a normative rationale. The author traces Guard history from its inception in 1636 to the present day and applies Kant's unchanging categorical imperative to volunteer service in the militias. She highlights that this is an ideal that is not always met by frail human beings but that the categorical imperative is always there, lurking in the historical record. With a thorough analysis of Kant's reasoning, the theory is chronologically applied to volunteer service in the National Guard through the perspective of the leadership of each particular era. This book is ideal for the study of American history, Enlightenment philosophy, and political science. It will appeal to scholars and academics as well as officers in Professional Military Education (PME), service academies and War Colleges, and the National Defense University.