Rudolf Höss
When World War I started, Höss served briefly in a military hospital.  Then, at age 14, he was allowed to join his father's and grandfather's old regiment, the German Army's 21st Regiment of Dragoons.  At age 15, he fought with the Ottoman Sixth Army at Baghdad, at Kut-el-Amara, and in Palestine.  While stationed in Turkey, he rose to the rank of  (sergeant).  At age 17, he was the youngest non-commissioned officer in the German Army.  While in the Army, he was injured three times and got malaria.  He was awarded the Ottoman Empire's Gallipoli Star, the Iron Cross first and second class, and other decorations.