A Kommando (German: [kɔˈmando], lit. "unit" or "command") is a general term for special police and military forces in German, Dutch, and Afrikaans speaking nations. It was also the term in the World War II era Luftwaffe for special units used to test new aircraft for combat readiness (as Erprobungskommando units) and examples existed that only used the "Kommando" name, such as the Luftwaffe Gruppe-sized Kommando Nowotny. In the winter/spring 1945 period, single-plane Kommando-designated units that used the Arado Ar 234 Blitz jet powered reconnaissance-bomber operated from hidden, forest-lined runways in eastern Germany.