Vietnam War, 1961-1975 History 351 Foreign relations 188 Politics and government 151 Veterans 151 Missing in action 141 Diplomatic relations 126 Protest movements 88 Aerial operations, American 84 HISTORY 80 Prisoners and prisons, North Vietnamese 73 Prisoners of war 61 Campaigns 60 Influence 59 Military campaigns 55 Influence (Literary, artistic, etc.) 52 Prisoners and prisons 52 Military 44 Armed Forces 43 History and criticism 43 Public opinion 43 General 42 War 41 Psychological aspects 40 American 37 Refugees 36 Peace 34 Social aspects 34 Vietnamkrieg 34 Vietnam War 33