Veltjens was re-assigned to Jasta 18 in August of 1917. Here he scored his ninth victory in November to close out 1917. He marked up his tenth victory in February, 1918.
|Veltjens' aircraft were often easily identified by a barbed arrow painted on the fuselage.|
It became an interesting swap, in which Berthold took his pilots with him when he transferred; Jasta 15's pilots in turn became Jasta 18. The exchange meant Berthold, Veltjens, and the rest of the pilots would be re-equipped with the new Fokker D.VII.
In May, 1918, Veltjens would temporarily assume command of Jasta 15, when Berthold was wounded and again in August 1918, serving as its commanding officer until the end of the war.
He ended the war with 35 victories. He was awarded Pour le Mérite, the Royal House Order of Hohenzollern, and the Iron Cross.