user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: What nation involved in the Vietnam War has a country calling code of 64? 
Knowledge Triplets: First Indochina War, base.culturalevent.event.entity_involved, Ho Chi Minh
Vietnam War, common.topic.notable_for, g.1258vfs7z
Vietnam War, military.military_conflict.commanders, m.0478plb
m.0b4887b, common.webpage.topic, Vietnam War
Vietnam War, common.topic.webpage, m.09w6h34
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Le Duan
Vietnam War, military.military_conflict.commanders, m.02h77tp
North Vietnam, military.military_combatant.military_conflicts, m.04ftw28
War in Vietnam, common.topic.notable_types, Military Conflict
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Anti-communism
North Vietnam, military.military_combatant.military_conflicts, m.04y_538
Hard Hat Riot, time.event.included_in_event, Opposition to United States involvement in the Vietnam War
m.0gm710l, government.national_anthem_of_a_country.country, South Vietnam
m.0bd31gj, military.military_combatant_group.combatants, North Vietnam
m.04kb4l7, military.casualties.combatant, North Vietnam
War in Vietnam, base.culturalevent.event.entity_involved, Ngo Dinh Diem
Vietnam War, base.culturalevent.event.entity_involved, Khmer Republic
m.0g5c716, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04z0zb9
Vietnam War, time.event.included_in_event, Indochina Wars
m.09w6h34, common.webpage.topic, Vietnam War
Single-party state, government.form_of_government.countries, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04z0cd1
Opposition to United States involvement in the Vietnam War, time.event.includes_event, Kent State shootings
Sino-Vietnamese War, base.culturalevent.event.entity_involved, Văn Tiến Dũng
North Vietnam, military.military_combatant.military_conflicts, m.04ftqs2
Opposition to United States involvement in the Vietnam War, time.event.includes_event, March Against the Vietnam War
1971 May Day protests, time.event.included_in_event, Opposition to United States involvement in the Vietnam War
m.0b78_7h, military.military_combatant_group.conflict, Joint warfare in South Vietnam, 1963–69
North Vietnamese invasion of Laos, time.event.included_in_event, Vietnam War
m.0bd485_, military.military_combatant_group.combatants, North Vietnam
Vietnam War, common.topic.webpage, m.09wmlvm
North Vietnam, military.military_combatant.military_conflicts, m.04yz_7h
Viet Cong, military.military_combatant.military_conflicts, m.04y_64r
Vietnam War, military.military_conflict.casualties, m.04kb4lw
North Vietnam, military.military_combatant.military_conflicts, m.04z002c
Vietnam War, common.topic.webpage, m.0b4887b
Vietnam War, common.topic.webpage, m.09w6pvn
Vietnam War, common.topic.webpage, m.09w6kz6
War in Vietnam, base.culturalevent.event.entity_involved, Le Duan
Vietnam War, base.culturalevent.event.entity_involved, Thailand
Joint warfare in South Vietnam, 1963–69, military.military_conflict.commanders, m.0c5n9pb
North Vietnam, military.military_combatant.military_conflicts, m.0b798ys
Sino-Vietnamese War, military.military_conflict.combatants, m.09hxz2s
m.09xm1xv, common.webpage.topic, Vietnam War
Vietnam War, common.topic.article, m.07_nr
Joint warfare in South Vietnam, 1963–69, time.event.included_in_event, Vietnam War
Vietnam, location.country.form_of_government, Socialist state
m.02h77fs, military.casualties.combatant, South Vietnam
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Viet Minh
m.09wx9cc, common.webpage.topic, Vietnam War
m.06482w8, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04z084z
First Indochina War, base.culturalevent.event.entity_involved, North Vietnam
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Pathet Lao
Vietnam War, military.military_conflict.combatants, m.03z9671
North Vietnam, military.military_combatant.military_conflicts, m.0g5c716
Vietnam War, base.culturalevent.event.entity_involved, China
Vietnam War, time.event.locations, Laos
North Vietnam, military.military_combatant.military_conflicts, m.04yxsw9
Vietnam War, military.military_conflict.casualties, m.02h77jh
m.0b78mbw, military.military_combatant_group.conflict, Joint warfare in South Vietnam, 1963–69
1975 Spring Offensive, base.culturalevent.event.entity_involved, South Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.06482w8
North Vietnam, military.military_combatant.military_conflicts, m.05cldkd
North Vietnam, military.military_combatant.military_conflicts, m.04z1097
North Vietnam, military.military_combatant.military_conflicts, m.0bd4cz8
Vietnam War, base.culturalevent.event.entity_involved, Taiwan
m.04y_64r, military.military_combatant_group.combatants, Viet Cong
North Vietnam, military.military_combatant.military_conflicts, m.06wj2w6
Vietnam War, base.culturalevent.event.entity_involved, Ho Chi Minh
Vietnam War, military.military_conflict.casualties, m.04kb4pq
War in Vietnam, base.culturalevent.event.entity_involved, Viet Cong
North Vietnam, military.military_combatant.military_conflicts, m.04yvsdy
North Vietnam, military.military_combatant.military_conflicts, m.04yz37j
Vietnam War, base.culturalevent.event.entity_involved, Lyndon B. Johnson
North Vietnam, military.military_combatant.military_conflicts, m.04ywmnk
North Vietnam, military.military_combatant.military_conflicts, m.04z0cm0
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Võ Nguyên Giáp
Self-immolations in protest to the Vietnam War, time.event.included_in_event, Opposition to United States involvement in the Vietnam War
Sino-Vietnamese War, military.military_conflict.commanders, m.0w5v3w_
North Vietnam, military.military_combatant.military_conflicts, m.0ggd4zm
Opposition to United States involvement in the Vietnam War, time.event.includes_event, Chicano Moratorium
Vietnam War, military.military_conflict.commanders, m.02h77w4
First Indochina War, base.culturalevent.event.entity_involved, Võ Nguyên Giáp
North Vietnam, military.military_combatant.military_conflicts, m.062v8cs
North Vietnam, military.military_combatant.military_conflicts, m.0b79163
Chicano Moratorium, time.event.included_in_event, Opposition to United States involvement in the Vietnam War
Vietnam War, common.topic.webpage, m.09xtw5q
m.0b79163, military.military_combatant_group.combatants, North Vietnam
m.0wg12cd, location.mailing_address.country, South Vietnam
First Indochina War, base.culturalevent.event.entity_involved, United States of America
Vietnam War, military.military_conflict.casualties, m.043wptp
Joint warfare in South Vietnam, 1963–69, time.event.locations, Laos
Opposition to United States involvement in the Vietnam War, time.event.includes_event, Moratorium to End the War in Vietnam
Joint warfare in South Vietnam, 1963–69, military.military_conflict.combatants, m.0b78mbw
Vietnam War, base.culturalevent.event.entity_involved, Hoàng Văn Thái
Vietnam War, military.military_conflict.combatants, m.03z9671
m.03z9671, military.military_combatant_group.combatants, New Zealand
Vietnam War, common.topic.image, UH-1combatmission1970
North Vietnam, military.military_combatant.military_conflicts, m.04y_39b
Vietnam War, time.event.locations, South Vietnam
Vietnam War, base.culturalevent.event.entity_involved, Cuba
m.09w6pvn, common.webpage.topic, Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.04yzp99
m.09j4467, military.military_combatant_group.combatants, North Vietnam
Opposition to United States involvement in the Vietnam War, time.event.includes_event, Hard Hat Riot
m.04yw881, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04z0g8_
m.0b78jlb, military.military_command.military_conflict, Joint warfare in South Vietnam, 1963–69
m.04y_538, military.military_combatant_group.combatants, North Vietnam
Southeast Asia, location.location.events, Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.07slz04
Vietnam War, military.military_conflict.casualties, m.02h77fs
Vietnam War, base.culturalevent.event.entity_involved, North Korea
Joint warfare in South Vietnam, 1963–69, military.military_conflict.commanders, m.0b78jlb
Vietnam War, base.culturalevent.event.entity_involved, Võ Nguyên Giáp
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Anti-communism
Vietnam, location.country.form_of_government, Single-party state
South Vietnamese đồng, finance.currency.countries_used, South Vietnam
Vietnam War, common.topic.webpage, m.09xgcz2
Vietnam, book.book_subject.works, Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.05cnzgm
North Vietnam, military.military_combatant.military_conflicts, m.04ftw8j
m.04kb4mf, military.military_combatant.casualties, New Zealand
Opposition to United States involvement in the Vietnam War, time.event.includes_event, 1971 May Day protests
North Vietnam, military.military_combatant.military_conflicts, m.04y_6r1
Vietnam War, base.culturalevent.event.entity_involved, William Westmoreland
Vietnam War, military.military_conflict.casualties, m.04kb4m4
Cyclo, film.film.country, Vietnam
September 1964 South Vietnamese coup attempt, base.culturalevent.event.entity_involved, South Vietnam
m.0c1qd3l, military.casualties.combatant, North Vietnam
Moratorium to End the War in Vietnam, time.event.included_in_event, Opposition to United States involvement in the Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.0bd485_
Vietnam War, base.culturalevent.event.entity_involved, Francoist Spain
m.04z0g8_, military.military_combatant_group.combatants, North Vietnam
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Nguyễn Văn Thiệu
Cambodian–Vietnamese War, base.culturalevent.event.entity_involved, China
Vietnam War, common.topic.webpage, m.09xwgxs
m.04z002c, military.military_combatant_group.combatants, North Vietnam
Vietnam War, common.topic.webpage, m.09xfyqk
Vietnam War, common.topic.webpage, m.0b47hsk
North Vietnamese invasion of Laos, base.culturalevent.event.entity_involved, Kingdom of Laos
m.04z084z, military.military_combatant_group.combatants, North Vietnam
War in Vietnam (1954-1959), military.military_conflict.commanders, m.0dh6jtq
Vietnam War, book.written_work.subjects, Southeast Asia
March Against the Vietnam War, time.event.included_in_event, Opposition to United States involvement in the Vietnam War
Vietnam War, base.culturalevent.event.entity_involved, Creighton Abrams
North Vietnam, military.military_combatant.military_conflicts, m.04ftw4b
Vietnam War, base.culturalevent.event.entity_involved, Le Duan
North Vietnam, military.military_combatant.military_conflicts, m.05cl1dh
Vietnam War, time.event.locations, Cambodia
Vietnam War, base.culturalevent.event.entity_involved, Viet Cong
North Vietnam, military.military_combatant.military_conflicts, m.04yzblp
Opposition to United States involvement in the Vietnam War, time.event.includes_event, Student Strike of 1970
Laotian Civil War, base.culturalevent.event.entity_involved, South Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.0g5cwl3
Vietnam War, military.military_conflict.casualties, m.02h77k6
Sino-Vietnamese War, time.event.included_in_event, Indochina Wars
Vietnam War, common.topic.image, Vietnamese village after an attack
North Vietnam, military.military_combatant.military_conflicts, m.0jmy703
North Vietnamese invasion of Laos, military.military_conflict.combatants, m.0g5cj73
m.09xwgxs, common.webpage.topic, Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.07llp3_
Vietnam, base.locations.countries.continent, Asia
South Vietnam, location.country.national_anthem, m.0gm710l
North Vietnam, military.military_combatant.military_conflicts, m.0b797xy
Vietnam War, base.culturalevent.event.entity_involved, Văn Tiến Dũng
Vietnam War, time.event.locations, Vietnam
m.0b481t3, common.webpage.topic, Vietnam War
Vietnam War, military.military_conflict.commanders, g.11btrq9dfw
m.09j3ckd, military.military_combatant_group.conflict, War in Vietnam (1954-1959)
Sino-Vietnamese War, base.culturalevent.event.entity_involved, Le Duan
Vietnam War, military.military_conflict.commanders, m.0w5r65c
North Vietnam, military.military_combatant.military_conflicts, m.0g5dgz6
North Vietnam, military.military_combatant.military_conflicts, m.04ftr19
War in Vietnam, military.military_conflict.combatants, m.09sdkpy
North Vietnam, military.military_combatant.military_conflicts, m.04z083c
Vietnam War, military.casualties.military_conflict, m.04kb4pf
Vietnam War, base.culturalevent.event.entity_involved, Nguyễn Văn Linh
War in Vietnam (1954-1959), time.event.included_in_event, Vietnam War
Vietnam War, common.topic.webpage, m.09y37g1
Kent State shootings, time.event.included_in_event, Opposition to United States involvement in the Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.04ywvbz
m.06wj2w6, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.0bd34v7
Vietnam War, base.culturalevent.event.entity_involved, Nguyễn Cao Kỳ
Vietnam War, book.written_work.subjects, United States of America
m.0b797xy, military.military_combatant_group.combatants, North Vietnam
m.09w6kz6, common.webpage.topic, Vietnam War
Vietnam, location.country.administrative_divisions, Hanoi
m.04z1097, military.military_combatant_group.combatants, North Vietnam
Vietnam War, base.culturalevent.event.entity_involved, Cao Văn Viên
1963 South Vietnamese coup, military.military_conflict.military_personnel_involved, Nguyễn Văn Thiệu
North Vietnam, military.military_combatant.military_conflicts, m.04yx8kv
Cambodian–Vietnamese War, base.culturalevent.event.entity_involved, People's Republic of Kampuchea
Vietnam War, military.military_conflict.casualties, m.04kb4l7
m.0g5dgz6, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04yvh30
Vietnam War, military.military_conflict.casualties, m.04kb4p4
Vietnam War, base.culturalevent.event.entity_involved, Kingdom of Laos
Vietnam War, common.topic.webpage, m.0b481t3
Vietnam War, base.culturalevent.event.entity_involved, Australia
North Vietnam, military.military_combatant.military_conflicts, m.04z0n0q
m.09xgcz2, common.webpage.topic, Vietnam War
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, South Vietnam
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Viet Cong
m.0g5cwl3, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04ywny8
North Vietnam, military.military_combatant.military_conflicts, m.0gx8n8z
North Vietnam, military.military_combatant.military_conflicts, m.04yw7ks
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Ngo Dinh Diem
m.0b798ys, military.military_combatant_group.combatants, North Vietnam
Vietnam War, base.culturalevent.event.entity_involved, Pathet Lao
m.09y37g1, common.webpage.topic, Vietnam War
Vietnam War, military.military_conflict.commanders, m.0478pmb
Vietnam War, military.military_conflict.casualties, m.04kb4ll
North Vietnamese invasion of Laos, base.culturalevent.event.entity_involved, North Vietnam
North Vietnam, location.country.form_of_government, Single-party state
Single-party state, government.form_of_government.countries, Vietnam
Vietnam, common.topic.notable_types, Country
North Vietnam, military.military_combatant.military_conflicts, m.04z0z3d
North Vietnam, military.military_combatant.military_conflicts, m.0gtztyw
North Vietnam, military.military_combatant.military_conflicts, m.0cmxgmm
North Vietnam, military.military_combatant.military_conflicts, m.04z15c1
Moratorium to End the War in Vietnam, base.vietnamwar.protest.organizations_involved, Congress for International Co-operation and Disarmament
North Vietnam, military.military_combatant.military_conflicts, m.03z97td
South Vietnam, location.country.currency_used, South Vietnamese đồng
Vietnam War, base.culturalevent.event.entity_involved, Anti-communism
m.0b47hsk, common.webpage.topic, Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.04z1mrp
Vietnam War, common.topic.webpage, m.09wkmg9
Joint warfare in South Vietnam, 1963–69, common.topic.notable_types, Military Conflict
War in Vietnam, time.event.locations, North Vietnam
Laotian Civil War, base.culturalevent.event.entity_involved, North Vietnam
m.0b78bs8, military.military_combatant_group.conflict, Joint warfare in South Vietnam, 1963–69
Vietnam War, base.culturalevent.event.entity_involved, North Vietnam
War in Vietnam, military.military_conflict.combatants, m.09sdkq2
North Vietnam, military.military_combatant.military_conflicts, m.04zd3yf
m.02h77gp, military.casualties.combatant, South Vietnam
Opposition to United States involvement in the Vietnam War, time.event.includes_event, Presidio mutiny
North Vietnam, military.military_combatant.military_conflicts, m.04yw881
South Vietnam, location.country.form_of_government, Republic
North Vietnam, military.military_combatant.military_conflicts, m.0bd31gj
North Vietnam, military.military_combatant.military_conflicts, m.04yx35t
m.03z97td, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.0dls8dn
Vietnam War, base.culturalevent.event.entity_involved, Ngo Dinh Diem
North Vietnam, military.military_combatant.military_conflicts, m.07lm3yg
Vietnam War, book.written_work.subjects, Vietnam
m.0gx8n8z, military.military_combatant_group.combatants, North Vietnam
m.09wmlvm, common.webpage.topic, Vietnam War
Vietnam War, book.written_work.subjects, Asia
Cambodian Civil War, base.culturalevent.event.entity_involved, North Vietnam
Opposition to United States involvement in the Vietnam War, common.topic.notable_types, Event
Vietnam War, common.topic.webpage, m.09xm1xv
Opposition to United States involvement in the Vietnam War, time.event.included_in_event, Vietnam War
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Ho Chi Minh
Vietnam War, base.culturalevent.event.entity_involved, Communism
Vietnam War, military.military_conflict.casualties, m.04kb4n8
Vietnam War, base.culturalevent.event.entity_involved, Richard Nixon
Battle of Saigon, base.culturalevent.event.entity_involved, South Vietnam
Joint warfare in South Vietnam, 1963–69, military.military_conflict.commanders, m.0b7915n
Vietnam War, base.culturalevent.event.entity_involved, Trần Văn Trà
Sino-Vietnamese War, time.event.locations, Vietnam
m.04z0cd1, military.military_combatant_group.combatants, North Vietnam
Vietnam War, military.military_conflict.casualties, m.04kb4nl
North Vietnam, location.country.form_of_government, Republic
Vietnam War, military.military_conflict.casualties, m.02h77gp
Vietnam War, military.military_conflict.commanders, m.07skn34
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Communism
War in Vietnam (1954-1959), time.event.locations, North Vietnam
m.0bd34v7, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04ftx09
North Vietnam, military.military_combatant.military_conflicts, m.04fts61
m.04kb4pf, military.casualties.combatant, New Zealand
North Vietnam, military.military_combatant.military_conflicts, m.04yvfm8
North Vietnam, military.military_combatant.military_conflicts, m.04z17nj
North Vietnam, military.military_combatant.military_conflicts, m.09j4467
War in Vietnam, base.culturalevent.event.entity_involved, Communism
m.0bd4cz8, military.military_combatant_group.combatants, North Vietnam
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Kingdom of Laos
War in Vietnam, base.culturalevent.event.entity_involved, United States of America
War in Vietnam, base.culturalevent.event.entity_involved, Anti-communism
War in Vietnam (1954-1959), time.event.locations, South Vietnam
m.0b7915n, military.military_command.military_conflict, Joint warfare in South Vietnam, 1963–69
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Cao Văn Viên
Vietnam War, military.military_conflict.casualties, m.04kb4mq
War in Vietnam, time.event.locations, South Vietnam
Vietnam, book.written_work.subjects, United States of America
Vietnam War, common.topic.webpage, m.09wx9cc
Sino-Vietnamese War, base.culturalevent.event.entity_involved, Vietnam
Joint warfare in South Vietnam, 1963–69, military.military_conflict.combatants, m.0b78bs8
Vietnam War, military.military_conflict.casualties, m.04kb4mf
m.0dh6jtq, military.military_command.military_conflict, War in Vietnam (1954-1959)
Opposition to United States involvement in the Vietnam War, time.event.includes_event, Self-immolations in protest to the Vietnam War
Southeast Asia, book.book_subject.works, Vietnam War
Cambodian–Vietnamese War, base.culturalevent.event.entity_involved, Democratic Kampuchea
Joint warfare in South Vietnam, 1963–69, time.event.locations, South Vietnam
m.09wkmg9, common.webpage.topic, Vietnam War
m.04y_64x, military.military_combatant_group.combatants, North Vietnam
Vietnam War, base.culturalevent.event.entity_involved, Nguyễn Văn Thiệu
Cambodian–Vietnamese War, base.culturalevent.event.entity_involved, Soviet Union
Vietnam War, military.military_conflict.casualties, m.04kb4kx
m.09xfyqk, common.webpage.topic, Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.04y_64x
Vietnam War, military.military_conflict.combatants, m.03z979q
South Vietnam, common.topic.notable_types, Country
Joint warfare in South Vietnam, 1963–69, time.event.locations, North Vietnam
Vietnam War, military.military_conflict.casualties, m.04kb4pf
North Vietnam, military.military_combatant.military_conflicts, m.04yv2ck
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Hoàng Văn Thái
m.0c5n9pb, military.military_command.military_conflict, Joint warfare in South Vietnam, 1963–69
North Vietnam, military.military_combatant.military_conflicts, m.03z979q
War in Vietnam (1954-1959), military.military_conflict.combatants, m.09j3ckd
m.03z979q, military.military_combatant_group.combatants, North Vietnam
Adrift, film.film.country, Vietnam
1963 South Vietnamese coup, base.culturalevent.event.entity_involved, South Vietnam
1963 South Vietnamese coup, military.military_conflict.military_personnel_involved, Nguyễn Cao Kỳ
South Vietnam, military.military_combatant.military_conflicts, m.04y_651
Vietnam War, military.military_conflict.commanders, m.02h77vl
Vietnam War, base.culturalevent.event.entity_involved, South Vietnam
War in Vietnam (1954-1959), time.event.included_in_event, Cold War
Vietnam, location.location.events, Sino-Vietnamese War
Vietnam War, time.event.locations, North Vietnam
m.04z083c, military.military_combatant_group.combatants, North Vietnam
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, William Westmoreland
War in Vietnam, base.culturalevent.event.entity_involved, Ho Chi Minh
War in Vietnam, base.culturalevent.event.entity_involved, South Vietnam
UH-1combatmission1970, common.image.appears_in_topic_gallery, Vietnam War
m.0jmy703, military.military_combatant_group.combatants, North Vietnam
South Vietnam, military.military_combatant.military_conflicts, m.04fts66
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Communism
North Vietnam, common.topic.notable_types, Country
Vietnam War, base.culturalevent.event.entity_involved, Nguyễn Hữu Thọ
North Vietnam, military.military_combatant.military_conflicts, m.04z0df9
Sino-Vietnamese War, base.culturalevent.event.entity_involved, China
Joint warfare in South Vietnam, 1963–69, military.military_conflict.combatants, m.0b78_7h
North Vietnam, military.military_combatant.military_conflicts, m.04z35mt
Cambodian–Vietnamese War, base.culturalevent.event.entity_involved, Vietnam
First Indochina War, time.event.locations, North Vietnam
1975 Spring Offensive, base.culturalevent.event.entity_involved, North Vietnam
Cambodian Civil War, base.culturalevent.event.entity_involved, South Vietnam
m.09xtw5q, common.webpage.topic, Vietnam War
Presidio mutiny, time.event.included_in_event, Opposition to United States involvement in the Vietnam War
m.04ftx09, military.military_combatant_group.combatants, North Vietnam
Cambodian–Vietnamese War, base.culturalevent.event.entity_involved, Thailand
War in Vietnam (1954-1959), common.topic.notable_types, Military Conflict
Vietnam War, time.event.locations, Southeast Asia
m.04yzp99, military.military_combatant_group.combatants, North Vietnam
Vietnam War, base.culturalevent.event.entity_involved, Khmer Rouge

Answer: New Zealand