An Erprobungskommando (EKdo) ("Testing-command") was a variety of Luftwaffe special-purpose unit tasked with the testing of new aircraft and weaponry under operational conditions. Similarly-named Erprobungs-prefixed squadron (staffel) and group (gruppe) sized units also existed at various times in the Luftwaffe during 1939-1944 to service-test new designs, usually numbered with the RLM aircraft designation system airframe number matching the aircraft they were meant to test, with the three digit number following the "8-xxx" RLM airframe number designating the unit, as with Erprobungsstaffel 177 (contracted to E-Staffel 177), charged with testing the A-0 production prototypes of the Heinkel He 177A heavy bomber. The similarly-prefixed Erprobungsgruppe 210 was meant to have service-tested the Messerschmitt Me 210 twin-engined "destroyer" and light bomber, but that design's early aerodynamic problems caused the unit's transformation and expansion into SKG 210, a dedicated "fast bomber" unit using Bf 110s instead.
Erprobungskommando 16 was formed March 1943 in Peenemünde-West, as a test unit for the new Messerschmitt Me 163 rocket fighter, and later based at the Luftwaffe airfield in Bad Zwischenahn for a considerable period of time. The unit was disbanded on 14 February 1945.
Erprobungskommando 154 was formed in November 1943 in Langenhagen, to test the new Focke-Wulf Ta 154 night fighter.
Erprobungskommando 162 was formed in January 1945 in Rechlin-Roggenthin, to test the new Heinkel He 162 jet fighter.
Erprobungsgruppe 210 was formed on 1 July 1940 in Köln-Ostheim, to test the Messerschmitt Bf 110 in a ground attack role. On 24 April 1941 the unit was redesignated I./Schnellkampfgeschwader 210.