History 244 World War, 1939-1945 137 Vietnam War, 1961-1975 96 Campaigns 78 Korean War, 1950-1953 67 Presidents 38 Armed Forces 32 more ... Foreign relations 31 Advertising, Public service 27 Design and construction 25 Military weapons 25 Advertising 23 Politics and government 23 Gettysburg, Battle of, Gettysburg, Pa., 1863 22 Basic training (Military education) 20 Veterans 18 Elections 17 Exhibitions 16 Military education 16 Military relations 16 Political campaigns 16 Vietnam War, 16 Generals 15 Parades 15 Military assistance, American 14 Horse-drawn vehicles 13 Soldiers 13 Transportation 13 Aerial operations 12 International relations 12 less ...