Which upgrades for the crew are usefull?

[MCM]

Which upgrades are usefull for the crew to upgrade and which upgrades have no effect or too less to give credit points? Which persons do you reward a medal (e.g. Ritterkreuz)?

[THEBERBSTER]

If you have TWOS then I would say the Bosun and the Cook because the Morale is broken in SH5 and you need all you can get.
Its a pity it has not been removed from the game altogether.
Peter