of South Dakota, Medal of Honor recipient in World War II Lindsey Graham, Senator from South Carolina Ralph Haben, former Speaker of the Florida House of Representatives Ken Holtzman, two-time major league baseball All Star pitcher Brock Lesnar, professional wrestler and former mixed martial artist Audie Murphy, highly decorated soldier from WWII, prolific 1950s actor Dan Quayle, 44th Vice President of the United States Cazzie Russell, former New York Knickerbockers basketball player Babe Ruth, former Major League Baseball player Tom Selleck, actor, Magnum, P.I.'' Rick Story, mixed martial artist in the UFC Tim Walz, Governor of Minnesota, former United States Representative from Minnesota Tulsi Gabbard, former United States Representative from Hawaii Trent Kelly, United States Representative from Mississippi Number of guardsmen by state, territory and D.C. A member of the NG, often called a "guardsman," is a person who has signed an Enlistment Contract and has subscribed to an Enlistment Oath, is still alive, or has not yet been discharged. The subscription to the oath (typically a recitation) and the signature must be witnessed by a person, typically a Guard officer, authorized as an official witness. The term of the enlistment, or membership, runs from the date on the contract through the date on the discharge or the death certificate. The "number of guardsmen" is a statistic generated by the Defense Manpower Data Center (DMDC), an agency of the DoD tasked with tracking the identities of all persons in the active military, its reserves, and civilians employed by it. Membership in the Guard may be regarded as an independent variable. It changes constantly. Its value at any instant cannot be known exactly. It can, however, be estimated from the records of the DMDC. Its data and reports are for the most part inaccessible to the general public, but it does make available some reports under the category "DoD Personal, Workforce Reports & Publications." The series "Military and Civilian Personnel by Service/Agency by State/Country (Updated Quarterly)," containing the statistics on membership in the NG by state, territory, and D.C., is updated every 3rd month at the end of the month. For example, one was generated on June 30, 2017. Like all statistics, these numbers of guardsmen are a sample culled according to a certain method. The report states that it uses the sources: "Active Duty Master File, RCCPDS, APF Civilian Master, CTS Deployment File, Civilian Deployment." The probabilities of the statistics