A Leutnant in the infantry when the war began, Berr was wounded in action on 6 September 1914. When he recovered, he was promoted to Oberleutnant and requested a transfer to the Fliegertruppe. After serving most of 1915 as an observer, Berr completed flight training and was posted to KEK Avillers. In March 1916, he scored his first two victories flying a Fokker Eindecker. By autumn, he was given command of Jasta 5 and was posted to the Somme front. Scoring eight more victories by the end of the year, he downed seven aircraft and one balloon. On 6 April 1917, Jasta 5 engaged 57 Squadron near Noyelles. In the heat of battle, Berr was killed in a crash following a mid-air collision with one of his Jasta pilots.