Talk:Mastery Rank/@comment-86.157.217.78-20150129120349/@comment-90.34.46.87-20150129124755

Each warframe, weapon, sentinel, archwing... has 3 custom appearances and 3 mods loadouts available. Those are named A, B, C.

Furthermore, each player receives loadout presets for its arsenal. The max number of loadout presets depends on your mastery rank. If you never used it there should only be the "default preset" under arsenal, but you can push the loadout options button in the lower right corner of the screen : it triggers a menu to manage your slots (rename, delete, duplicate).