War and neutrality — War in general — Definition and technical meaning of war — Vietnam conflict — Currency found by United States soldier engaged in combat operation — Whether captured public property of enemy in time of war — The law of the United States

War and neutrality — Warfare on land — Appropriation of enemy property — Vietnam — Currency found by United States soldier during combat operation in area of South Vietnam in dispute between rival forces — Whether treasure trove — Whether captured enemy property — The law of the United States