When France entered World War 2 the number of men available for military service was far fewer that it had been in 1914. Also, the height, weight, and general physical health of enlistees was less than it had been 25 years earlier. The great bloodbath of 1914-18 had taken its toll. The best and brightest had been lost on the battlefields of northern France, and those brave young men did not live to have children.
Germany had also suffered severe losses during the Great War, but its young and growing population bounced back much more quickly. Nevertheless, German leaders also became conscious of adverse effects from the previous conflict. During the Polish campaign of 1939 a number of Wehrmacht generals complained that the quality and performance of their soldiers did not approach the high standards set by their fathers in 1914.
Universal military conscription when allied with the ruthlessness of total war means that the strongest and most capable males are sacrificed in the maelstrom of conflict. In recent years young females are also being recruited for potential slaughter. It is the very opposite of “survival of the fittest.” If Western Civilization experiences another period like the first half of the 20th Century we might all regress to a state of gibbering idiocy.
May the good Lord preserve us from such madness!