Information:  - World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although related conflicts began earlier. It involved the vast majority of the world's nationsincluding all of the great powerseventually forming two opposing military alliances: the Allies and the Axis. It was the most widespread war in history, and directly involved more than 100 million people from over 30 countries. In a state of "total war", the major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, erasing the distinction between civilian and military resources. Marked by mass deaths of civilians, including the Holocaust (in which approximately 11 million people were killed) and the strategic bombing of industrial and population centres (in which approximately one million were killed, and which included the atomic bombings of Hiroshima and Nagasaki), it resulted in an estimated 50 million to 85 million fatalities. These made World War II the deadliest conflict in human history.  - Hiroshima is perhaps best known as the first city in history to be targeted by a nuclear weapon when the United States Army Air Forces (USAAF) dropped an atomic bomb on the city (and later on Nagasaki) at 8:15 a.m. on August 6, 1945, near the end of World War II.  - The Iron Cross (abbreviated EK) was a military decoration in the Kingdom of Prussia, and later in the German Empire (18711918) and Nazi Germany (19331945). It was established by King Friedrich Wilhelm III of Prussia in March 1813 backdated to the birthday of his late wife Queen Louise on 10 March 1813 during the Napoleonic Wars (EK 1813). Louise was the first person to receive this decoration (posthumous). The recommissioned Iron Cross was also awarded during the Franco-Prussian War (EK 1870), World War I (EK 1914), and World War II (EK 1939, re-introduced with a swastika added in the center). The Iron Cross was normally a military decoration only, though there were instances of it being awarded to civilians for performing military functions. Two examples of this were civilian test pilots Hanna Reitsch who was awarded the Iron Cross 2nd Class and 1st Class and Melitta Schenk Gräfin von Stauffenberg, who was awarded the Iron Cross 2nd Class, for their actions as pilots during World War II.  - Melitta Schenk Gräfin von Stauffenberg, born Melitta Schiller (9 January 1903  8 April 1945), was a German Aviator who served as a test pilot in the Luftwaffe before and during World War II.  - Nazi Germany is the common English name for the period in German history from 1933 to 1945, when Germany was governed by a dictatorship under the control of Adolf Hitler and the Nazi Party (NSDAP). Under Hitler's rule, Germany was transformed into a fascist state in which the Nazi Party took totalitarian control over nearly all aspects of life. The official name of the state was "Deutsches Reich" from 1933 to 1943 and "Großdeutsches Reich" ("Greater German Reich") from 1943 to 1945. The period is also known under the names the Third Reich and the National Socialist Period (abbreviated as "NS-Zeit"). The Nazi regime came to an end after the Allied Powers defeated Germany in May 1945, ending World War II in Europe.  - Erich Walther ( 5 August 1903 -- 26 December 1947 ) was a German general of the Fallschirmjäger who served during World War II. He was also a recipient of the Knight 's Cross of the Iron Cross with Oak Leaves and Swords . The Knight 's Cross of the Iron Cross and its higher grade Oak Leaves and Swords was awarded to recognise extreme battlefield bravery or successful military leadership .  - Strategic bombing is a military strategy used in a total war with the goal of defeating the enemy by destroying its morale or its economic ability to produce and transport materiel to the theatres of military operations, or both. It is a systematically organized and executed attack from the air which can utilize strategic bombers, long- or medium-range missiles, or nuclear-armed fighter-bomber aircraft to attack targets deemed vital to the enemy's war-making capability.    After reading the paragraphs above, choose the best answer for the entity that related to 'erich walther' with the relationship of 'military branch'.  Choices: - aircraft  - army  - luftwaffe  - nazi party  - united states army
The answer to this question is:
luftwaffe