At that time, the victory of the Chinese Workers' and Peasants' Red Army on the 25000-mile long March shocked the world  shock was not the annihilation of the enemy, but mainly the Red Army's ability to survive in extreme cold, hunger, fatigue, hypoxia and dirt when it crossed the snow-capped mountains and grasslands
The hardship embodies the tenacious survival ability of human beings
 Many countries are training the survivability of officers and soldiers under extremely difficult conditions such as lack of roads, water, food, fire, light and oxygen deprivation