At Central City, the Heartland Veterans Memorial honors veterans of all five military service branches, including those who served in war, in foreign deployments, in combat, and in duties outside declared conflicts. It defines a military veteran as anyone who served for any length of time in any branch, a war veteran as one ordered to foreign soil or waters for direct or support activity against an enemy, and a combat veteran as one who experienced hostility from offensive, defensive, or friendly fire military action involving a real or perceived enemy in a foreign theater. Since the United States was founded in 1776, it has been involved in war or conflict for more than 200 years of its existence, with about a 91 percent chance that any given year since 1776 included American involvement in war or conflict, rising to 93 percent if covert CIA operations and other acts are counted, and the U.S. has never gone a decade without a war. The Congressional Research Service recorded 330 notable overseas deployments of U.S. military forces since 1798, not including limited engagements such as blockades, humanitarian airdrops, rescue operations, raids, and drone strikes. U.S. forces are deployed in more than 150 countries, and in November 2015 the worldwide total of U.S. troops was 1,145,093, excluding military or civilian contractors and dependents. Since the American Revolutionary War began in 1775, American conflicts led to 2,852,901 total casualties, including 1,498,237 wounded and 1,354,664 deaths, of which 664,440 were from combat; World War II accounted for 44 percent of combat deaths, the Civil War 32 percent, Vietnam 7 percent, and the Korean War 5 percent, while 40,917 Americans were reported missing as of January 2016. The account also notes that casualties can come not only from wars and conflicts but from training, traffic accidents, routine operations, embassy guarding, hostile aggression, terrorism, and covert actions. Among incidents highlighted are the Berlin Blockade and Berlin airlift of 1948–1949, when the Soviet Union blocked Western access to Berlin and the Western Allies responded with 277,806 flights by 300 aircraft carrying 2.34 million tons of supplies to West Berlin’s 2.2 million inhabitants before the blockade was lifted; the 1960 shootdown over Russia of a U-2 spy plane piloted by Francis Gary Powers; the thirteen-day Cuban Missile Crisis of October 1962 over Soviet missiles in Cuba and its resolution through a U.S.-Soviet agreement; the January 23, 1968 capture of the USS Pueblo by North Korean forces, in which one crewman was killed and the remaining 82 were imprisoned for eleven months; and the October 23, 1983 Beirut barracks bombings in Lebanon, which killed 241 U.S. personnel, 58 French peacekeepers, and 6 civilians.