the relevance of such an additional crew member is limited if an army really goes all-mobile warfare and establishes a 2nd crew for every tank.
The Germans had 2nd crews in May 1940, which successfully helped against the problem of crew fatigue.
Nowadays it would be less about fatigue as the internal space of a modern tank is less hellish, but it would still help a lot against sleep deficits, against the maintenance burden and it would allow commanders to replace the men who turned out to be duds in combat (it happens, no matter how they excelled in peacetime training).
Over the past three decades the impact of the energy industry on the North American economy has dramatically increased as North American governments have implemented various levels of deregulation. This has resulted in extreme price volatility for both the individual consumers and business. The purpose of this course is to provide business students with a broad introductory overview of the economic impact of the energy industry on consumers and business in Canada as it has evolved since its deregulation in the 1980's. Prerequisite: Acceptance into the Bachelor of Business Administration program.