“Don’t complain, just work harder. That way you can save those that need saving.” 

Characters are limited to training up to one armor and one weapon type max per character. Once learned, the selection cannot be changed. This downtime follows the general rules for all training downtime as found here.

• • Only one item from each table; Weapons (either A/B) + Armors (C) may be learned.

Armor Proficiency. Anyone can put on a suit of armor or strap a Shield to an arm. Only those proficient in the armor’s use know how to wear it effectively, however. If you wear armor that you lack proficiency with, you have disadvantage on any ability check, saving throw, or Attack roll that involves Strength or Dexterity, and you can’t cast Spells.