Cargo trucks have been an essential part of American warfare since the First World War, as they transport troops and deliver supplies and vital ammunition and material.During the Vietnam War, these vital vehicles became the prime target for the North Vietnamese Army, which would attack them from behind the jungle landscape.To counter these ambushes, the US Army wanted the trucks to fight back instead of merely developing a thick armor for them.Landmine-covered Convoy trucks were then born. And they even reappeared in the 21st century.