In the spring of 1943 German panzer forces around Kharkiv are getting ready for the next offensive. The Tiger in the photo belongs to 2. SS-Panzer-Grenadier-Division “Das Reich”. The man at the front had just rammed the cleaning rod and brush assembly through the bore all by himself!
Bundesarchiv, Bild 101III-Gutscher-001-05/Gutscher/CC BY-SA 3.0 de, via Wikimedia Commons