In 2002, 22,448 active-duty federal military personnel were stationed at nine military installations in Arizona. Major military installations include the Army's Fort Huachuca at Sierra Vista; the Air Force's Williams base near Phoenix, and the Luke and Davis-Monthan bases, near Phoenix and Tucson, respectively; and the Marine Corps' Yuma Air Station. Defense Department expenditures in Arizona were approximately $8.9 billion in 2002, $6.6 billion for contracts and about $2.1 billion for payroll.
There were 562,916 veterans of US military service in Arizona as of 2000, of whom 115,615 served in World War II; 71,943 in the Korean conflict; 150,138 during the Vietnam era; and 66,563 during 1990–2000 (including the Persian Gulf War). On 10 September 1992, Nathan E. Cook, the last veteran of the Spanish-American War (1898–1902), died in Phoenix at the age of 106. Veterans' benefits totaled $1.0 billion in 2002.
As of June 2000, the Arizona Department of Public Safety employed 1,050 full-time sworn officers.