Today in WW II: 31 Jul 1941 SS Major General Reinhard Heydrich ordered by Göring to prepare "...a total solution of the Jewish question [Gesamtlösung der Judenfrage]..." in European areas controlled by Germany.   

Pre-World War II 5-ton Mack Trucks

Mack EHT Scan: Courtesy of Richard Notton from Bart Vanderveen's Observer's Fighting Vehicle Directory, WW II
Scan: Courtesy of Richard Notton from Bart Vanderveen's "Observer's Fighting Vehicle Directory, WW II."

Mack EHU Scan: Courtesy of Richard Notton from Bart Vanderveen's Observer's Fighting Vehicle Directory, WW II
Scan: Courtesy of Richard Notton from Bart Vanderveen's "Observer's Fighting Vehicle Directory, WW II."