Despite their defeat in World War I, the German officer corps in the interwar period still saw the main means of victory in a future war in an offensive operation. Thus, he drew a different experience from the Great War than his French counterpart. Based on the experience of 1914-1918, including the infiltration tactics used by the Stosstruppen troops, but also noticing the intense development of aviation and armored weapons, part of the German officer corps (e.g. Gen. Heinz Guderian) developed theoretical assumptions of the so-called lightning war (German: Blitzkrieg), that is, striving to knock down the enemy with one decisive offensive operation carried out in the shortest possible time and with the maximum intensity of forces and resources. The German officer corps was also trained according to this offensive doctrine of war in the 1930s and during the world war. It is also worth adding that German officers of almost all levels in the course of World War II used the principle of the so-called command by task (Ger. Auftragstaktik), that is, they outlined to their subordinates the task to be achieved and the forces at their disposal, while the execution of the task was entirely up to them. Such a model of command, based on very well and uniformly trained officers, led to the fact that the German army was highly flexible in action and was able to react faster to various levels than its opponents (e.g. the French army during the campaign of 1940 or Soviet army of 1941). This system proved successful (especially at lower levels) throughout World War II. It is also worth adding that many outstanding commanders served in the German officer corps from the Second World War, including: Erich von Manstein, Heinz Guderian, Erwin Rommel and Walter Model.
The first paramilitary unit to have the abbreviation SS (German: Schutz Staffel) in its name was the personal protection of the dictator of the Third Reich called Leibstandarte Adolf Hitler, which was officially formed in 1933. From 1934, the SS was an independent formation headed by Heinrich Himmler. With time, further SS units were formed, including the SS-Totenkopfverbände and the SS-Verfügungstruppe. It is worth adding that the latter was trained similarly to regular Wehrmacht infantry units. On a relatively small scale, SS units were used in combat during the fighting in Poland in 1939 and in the French campaign in 1940. The first units intended from the beginning to fight at the front were created in mid-1940, giving them the name of the Waffen SS. Initially, they were recruited on a voluntary basis, also among non-German people, but over time, compulsory recruitment began to apply. Within the Waffen-SS, many divisions of different combat value were formed. Nevertheless, a few of them (e.g. the 1st SS LAH Panzer Division, the 2nd SS Das Reich Panzer Division or the 12th SS Hitlerjugend Panzer Division) can be considered elite units, with very high combat value and often equipped with the best available equipment. They demonstrated their considerable advantages not only on the Eastern Front (1941-1945), especially during the battles near Kharkiv in 1943, but also during the battles in France in 1944. Another thing is that the quality of the commanding staff of these units was in many cases debatable, and many Waffen-SS soldiers committed war crimes during World War II.