In the wake of World War II, Vietnam had become the next major battleground of the 20th century. It started with a battle for independence against the French, led by Ho Chi Minh and backed by the communist nations. Along with Laos and Cambodia, Vietnam finally became independent, but the country was split up in a communist northern and a democratic southern part. After attempts to reunite the country through elections failed, the southern part sunk deeper into political instability.
A flock of birds flies in formation when travelling long distances, due to an energy saving advantage. Research on this phenomenon has been conducted throughout the beginning of the twentieth century, and it focused on how much can be gained using formation flight, where unfavorable effects have only been a topic of research for the last few decades.